Hairdressing, Hair Styling and Hair Products — Detailed Research Report

Research date: September 17, 2026 Companion to: Deep Research Brief: Hairdressing, Hair Styling, and Hair Products

This report collects five research dossiers built from web sources: regulators, courts, peer-reviewed studies, licensing boards, BLS and company disclosures. Every key finding carries a confidence rating and links. Each dossier ends with its open questions and full source list.

Contents

1. Hair color, chemical services and chemical safety
2. Textured hair, inclusion, cutting and styling
3. Hair products, ingredients, claims and evidence
4. Hot tools, salon technology, AI and stylist health
5. Salon business, licensing, economics and industry trends

Headline findings (as of September 2026)

• Formaldehyde: there is still no federal ban. The FDA proposal has never been published and has missed six target dates. California and Maryland have banned formaldehyde in cosmetics since January 1, 2025. Washington has also banned it and adds 25 formaldehyde releasers in 2027. Glyoxylic acid, a common "formaldehyde-free" substitute, is under EU review over kidney-injury reports.
• Hair relaxers: the NIH Sister Study and others show an association with uterine cancer, not proven causation. The federal lawsuits (MDL 3060) have about 12,000 pending cases, no trial and no settlement. Arizona sued L'Oréal on September 9, 2026.
• MoCRA: facility registration, product listing and adverse-event reporting are in effect. The manufacturing-standards rule is delayed, the fragrance-allergen labeling rule hasn't been proposed, and the talc-testing proposal was withdrawn in November 2025.
• Hair dye allergy: 5.6% of North American patients patch-tested react to PPD, and hair dye is the source for most of them. A 2025 study found unlisted PPD in some dyes labeled "PPD-free."
• CROWN Act: 30 states plus D.C. have some version. The federal bill has not had a vote.
• Textured-hair education: nine states now require it in cosmetology training, including New York (from September 1, 2026) and New Jersey (signed January 2026).
• Traction alopecia: the AAD says pain means a style is too tight. Early traction alopecia is often reversible, but scarring alopecia (CCCA) needs a dermatologist early.
• Rosemary oil: the evidence rests mainly on one 2015 trial of 100 people with no placebo. It found results similar to 2% minoxidil after six months.
• Biotin: the FDA warns it can distort lab tests, including heart tests. Reviews find no hair benefit for people who aren't deficient.
• Dry shampoo benzene: P&G recalled products in December 2021 and Unilever in October 2022, both blaming contaminated propellant.
• State ingredient and PFAS bans: PFAS bans in cosmetics took effect in 2025–2026 in CA, CO, MD, MN, WA, ME and VT.
• Heat: about 180°C is a practical upper limit for dry hair, and wet hair is damaged at lower temperatures. In one study, a moving blow-dryer held 15 cm away did less damage than air-drying.
• Counterfeit tools: fake Dyson and ghd tools are a real safety risk. A UK safety notice found a high electric-shock risk in a fake Supersonic.
• Salon software: payment and marketplace fees often cost more than the subscription. Fresha takes 20% of a new marketplace client's first booking.
• Jobs and pay (BLS): 670,800 jobs in 2025. Median pay is $17.21/hour for hairstylists and $18.37 for barbers. Employment is projected to grow 7% from 2025 to 2035. Most barbers and nearly half of stylists are self-employed.
• No tax on tips: barbers, hairdressers, hairstylists and cosmetologists are on the Treasury tipped-occupation list. The deduction is up to $25,000 for 2025–2028 and phases out at higher incomes.
• Cosmetology Licensure Compact: 13 member states; the first multistate licenses are reportedly being issued.
• Salon suites: growth continues, with Sola at 750+ locations, Phenix at 420+ and MY SALON Suite at 370+ (company counts). Regis is now 93% franchised.

Research limits

The research hit a 200-search tool limit, and some sites rate-limited or blocked access (including PubMed). Items the dossiers couldn't confirm are marked "unverified" or "not re-verified" and listed under "Open questions." Figures from law-firm, vendor or industry sources are labeled as such.

Research Dossier 01: Hair Color, Chemical Services, and Chemical Safety/Regulation

Research date: September 17, 2026 Scope: Oxidative color, lighteners, developers and toners; PPD/hair-dye allergy and patch-test guidance; bond builders (Olaplex, K18) and the lilial/Olaplex lawsuit issue; formaldehyde and releasers in smoothing treatments (FDA proposed ban, OSHA, state laws); chemical relaxer cancer research and MDL 3060 litigation; MoCRA implementation; EU Cosmetics Regulation restrictions relevant to hair; salon occupational exposures (NIOSH-affiliated research, IARC). Method note: WebSearch and WebFetch only. Late in the session, the web search budget ran out and WebFetch returned persistent HTTP 429 rate-limit errors. As a result, the bond builder section and some EU hair-dye regulation and IARC details depend on background knowledge and search-result titles rather than fetched pages. Those items are flagged [not re-verified] and given lower confidence. All litigation and regulatory status items are "as of September 2026" and were checked against 2026 sources.

Key findings

1. No federal U.S. formaldehyde ban for hair smoothing products exists as of Sept. 2026. FDA's proposed rule (RIN 0910-AI83) first appeared on the Spring 2023 Unified Agenda (NPRM target April 2024) and has never been published in the Federal Register. Missed targets: Oct 2023, Apr 2024, Nov 2024, Mar 2025, Jul 2025, Dec 2025. A July 31, 2026 industry report says the 2026 agenda targets November 2026. Confidence: High (not published); Medium (Nov 2026 target, not verified on Reginfo.gov). Reginfo; Powers Health/HealthDay; Certified Cosmetics; Marin Murphy Law
2. State bans are already in force. California (AB 2762) and Maryland (HB 643) ban intentionally added formaldehyde, paraformaldehyde, methylene glycol and quaternium-15 in cosmetics from Jan. 1, 2025. Washington's TFCA restricts formaldehyde and methylene glycol from Jan. 1, 2025 and 25 more formaldehyde releasers from Jan. 1, 2027 (retail sell-through to Dec. 31, 2027). Confidence: High. WA Ecology; Md. Code via Justia; CA DTSC
3. Hair relaxer MDL 3060 is large and pre-trial. 12,129 actions pending (16,561 total ever filed) on Sept. 1, 2026 before Judge Mary M. Rowland (N.D. Ill.). 10-case bellwether pool selected April 2, 2026; defendants' Rule 702 motions to exclude general-causation experts filed May 5, 2026 (ruling not reported as of research date); no trial held and no global settlement. Arizona AG sued L'Oréal USA (filed Sept. 9, announced Sept. 11, 2026). Confidence: High (counts, bellwether pool, AZ suit); Medium (downstream schedule dates from law-firm trackers). JPML; Joint Status Report May 2026; AZ AG
4. Relaxer–cancer evidence shows associations, not established causation. Sister Study 2022: frequent straightener use linked to about 2x uterine cancer risk (est. 4.05% vs 1.64% by age 70). BWHS 2023: significant only in postmenopausal long-term users (HR 1.64–1.71). Sister Study ovarian (HR 2.19) and 2025 non-reproductive cancers (pancreatic HR 2.66, thyroid HR 1.71). No study had brand/ingredient data. Confidence: Medium-High for association; Low for causation/ingredient. NIH; BWHS
5. MoCRA is half-implemented. In effect: registration and listing (enforced from July 1, 2024; 14,299 facilities / 992,907 listings as of Jan. 6, 2026), serious adverse event reporting within 15 business days, safety substantiation, recall and records authority. Delayed: GMP rule (long-term action), fragrance allergen labeling (not proposed). Withdrawn: talc asbestos-testing proposed rule (Nov. 28, 2025). Confidence: High. FDA; Foley; Federal Register
6. PPD allergy: 0.8% general-population prevalence in five European countries (black henna tattoo aOR 9.33). 5.6% positive among 54,917 NACDG patch-tested patients (1994–2018); hair dye was the source in 73.5%, and hairdressers/cosmetologists made up 72.8% of occupational cases. Confidence: High. JID 2016; Dermatitis 2023
7. "PPD-free" claims are unreliable: 5 of 51 dyes contained unlisted PPD, 4 of those labeled PPD-free (Dermatitis, 2025). Confidence: High (for that sample). Needle et al.
8. Glyoxylic acid (common "formaldehyde-free" smoothing active) was confirmed by France's ANSES (Jan. 2025) as very likely responsible for acute kidney failure cases; the EU SCCS has a mandate to assess safety up to 16%, with a data call open until May 2027. Confidence: High. ANSES; COSlaw
9. Occupational: IARC classifies occupational exposure as a hairdresser/barber as "probably carcinogenic" (Group 2A); personal hair dye use is "not classifiable" (Group 3) (Vol. 99, 2010). UK IIAC (2014) found bladder cancer relative risks of only about 1.2–1.7 and did not recommend prescription. Confidence: High for IIAC (fetched); Medium-High for IARC Vol. 99 wording [not re-verified]. IIAC; IARC Vol 99
10. Bond builders: Mechanism claims (disulfide re-linking by bis-aminopropyl diglycol dimaleate; K18 peptide) are mainly brand-supported. Independent head-to-head blinded evidence was not found. Olaplex Feb. 2023 hair loss suit (LA Superior Court): final outcome NOT verified. EU lilial ban effective March 1, 2022. Confidence: Low-Medium [not re-verified].

1. How oxidative color, lighteners, developers and toners work

(Background chemistry; standard cosmetic science. Confidence High for general mechanisms; no single fetched source. Recommend the site's color-theory cluster add a textbook/SCCS citation.)

• Permanent (oxidative) color: Primary intermediates ("precursors" such as p-phenylenediamine [PPD], toluene-2,5-diamine [PTD/PTDS], p-aminophenol) and couplers (resorcinol, m-aminophenol, etc.) are mixed with hydrogen peroxide developer in an alkaline base (ammonia or monoethanolamine). The alkali swells the cuticle; small precursors diffuse into the cortex, are oxidized, and couple into larger colored molecules trapped in the fiber. Peroxide also lightens natural melanin (typically 1–3 levels, depending on developer volume).
• Developer strengths (U.S. convention): 10 vol (3%), 20 vol (6%), 30 vol (9%), 40 vol (12%) hydrogen peroxide. Higher volume means more lift and more damage.
• Demi-permanent: Oxidative but low-alkaline, lower peroxide, deposit-only or minimal lift. It may still contain PPD/PTD.
• Semi-permanent/direct dyes: Preformed color molecules (HC and basic dyes). No developer is needed, and color gradually washes out. Some contain azo or nitro dyes that may cross-react with PPD.
• Lighteners (bleach): Persulfate salts (ammonium/potassium/sodium persulfate) plus hydrogen peroxide at high pH oxidize eumelanin and pheomelanin. They damage keratin by oxidizing cystine disulfide bonds to cysteic acid and lifting the cuticle. Persulfates are recognized causes of occupational asthma and rhinitis in hairdressers.
• Toners: Usually demi- or semi-permanent deposit shades used to neutralize unwanted warmth (violet cancels yellow, blue cancels orange) after lightening.
• Henna and progressive dyes: Pure henna (lawsone) and bismuth citrate are FDA-approved color additives for hair. Lead acetate was delisted, effective Jan. 6, 2022. FDA Hair Dyes
• U.S. coal-tar dye exemption: Oxidative "coal-tar" hair dyes need no FDA approval if labeled with the statutory caution and patch-test instruction. They may not be used on eyelashes or eyebrows. FDA says it lacks "reliable evidence showing a link between cancer and coal-tar hair dyes on the market today." FDA (updated Sept. 25, 2025)

Personal hair-dye cancer epidemiology (context): The CIR Expert Panel (industry-funded via PCPC) reviewed the literature in its 2025 cycle and concluded the data "do not provide sufficient evidence to support a causal relationship between personal hair dye use and cancer." It cited the Nurses' Health Study (117,200+ nurses, 36 years; no overall solid-cancer association) and the Sister Study breast cancer finding (45% higher risk among Black women using permanent dye vs 7% among White women). CIR, Aug. 15, 2025. Limitation: industry-funded body; use alongside independent reviews.

2. PPD and hair-dye allergy

Prevalence and risk factors

• General population (Europe): 10,425 surveyed; 2,739 randomly patch-tested across five countries; PPD allergy 0.8% (95% CI 0.6–1.0). No significant association with hair-dye use or gender. Black henna tattoo: 3.2% vs 0.6%, aOR 9.33 (3.45–25.26). Clinically relevant dye-linked reactions: 0.1%. Diepgen et al., JID, 2016
• Clinic population (North America): NACDG 1994–2018, 54,917 patients, 5.6% positive (3,095). Female OR 1.52; age >40 OR 1.55; White OR 0.66. Source: hair dye 73.5%, apparel 3.9%. Occupational 8.3%, of which hairdressers/cosmetologists 72.8%. Sites: face 25.5%, hands 21.9%. Co-reactions: benzocaine 11.3%, disperse dye mix 6.5%, black rubber mix 5.1%. Warshaw et al., Dermatitis, 2023
• Cross-reactors: PTDS (tolerated by ~50% of PPD-allergic people), azo dyes, PABA, benzocaine/procaine, sulfonamides. Diagnostic patch test uses 1% PPD in petrolatum. Rare systemic reactions include anaphylaxis and acute kidney failure (the latter linked to ingestion/black henna contexts). DermNet, July 2024
• "PPD-free" products: Of 51 dyes (39 marketed PPD-free), 7 had undisclosed allergens. 5 contained unlisted PPD (4 labeled PPD-free), 1 of them above 2%. Two had undisclosed p-aminophenol, and one each had 2-nitro-PPD and henna. Needle et al., Dermatitis, online June 24, 2025
• ME-PPD (2-methoxymethyl-PPD) is studied as a lower-sensitizing alternative. JAAD 2018 [not re-fetched; check funding — ME-PPD was developed by industry].

Patch/skin allergy test guidance

• U.S. statutory caution (FD&C Act coal-tar exemption): "Caution – This product contains ingredients which may cause skin irritation on certain individuals and a preliminary test according to accompanying directions should first be made. This product must not be used for dyeing the eyelashes or eyebrows; to do so may cause blindness." FDA says to test before each application. FDA
• EU labeling (Directive 2009/134/EC, now Regulation 1223/2009 Annex III): "Hair colorants can cause severe allergic reactions. Read and follow instructions. This product is not intended for use on persons under the age of 16. Temporary 'black henna' tattoos may increase your risk of allergy." There are also "Do not colour your hair if…" warnings. Cosmetics & Toiletries. A dermatology study cited there found test site "practically irrelevant" for interpretation.
• EU PPD limit: Maximum 2% (as free base) on-head after oxidative mixing (Annex III). [not re-verified in this session; high background confidence]
• Manufacturer (L'Oréal Paris/Garnier): "Always perform a hair allergy test 48 hours before each use of a colourant product"; allergies "can develop suddenly." Be Colour Safe
• NHS (reviewed Dec. 29, 2025): Symptoms may take up to 72 hours. Test at least 48 hours before each use. Call 999 for swelling of lips/throat or breathing difficulty. Rashes on darker skin may look brown, purple or grey. NHS
• AAD: Could not retrieve AAD-specific hair dye guidance in this session. Open item.
• State laws: CA AB 2762 / MD / WA restrict "phenylenediamine" salts (m- and o-phenylenediamine). Our reading is that PPD (para-) itself is not banned. [Medium confidence; verify statutory text]

3. Bond builders

[Section largely not re-verified: web search budget exhausted and fetch rate-limited]

• Chemistry of damage: Covered in §1. Bleach converts cystine to cysteic acid, so those bonds can't simply re-form.
• Olaplex: The active is bis-aminopropyl diglycol dimaleate (patented; developed by materials scientists). The brand claims it links broken disulfide bonds. Outside scientists have suggested alternative mechanisms (ionic crosslinking of maleate with protein amines, damage limitation). Confidence: Medium (mechanism debate); independent clinical evidence not located.
• K18: Proprietary "K18Peptide" leave-in mask, claimed to reconnect keratin polypeptide chains. Company-supported data. Confidence: Low-Medium; no independent trial located.
• Lilial (butylphenyl methylpropional): Classified CMR 1B (reproductive toxicant). Banned in EU cosmetics from March 1, 2022 (Omnibus IV, Reg. (EU) 2021/1902). Olaplex removed it from No.3 in 2022. Also added to California's AB 496 list ("lily aldehyde"), effective Jan. 1, 2027 (Keller & Heckman, fetched). Confidence: High (CA); Medium-High (EU date, not re-fetched).
• Olaplex hair loss lawsuit: Filed Feb. 2023, Los Angeles County Superior Court, by a group of consumers (reported initial count ~28, later more) alleging hair loss/scalp injury and citing lilial and other ingredients. Olaplex denied it and publicized third-party testing. Outcome NOT verified. Search results listed CBS News, Dermatology Times, BeautyMatter, and a ConsumerShield 2026 update, but these could not be opened.

4. Formaldehyde and releasers in keratin/smoothing treatments

Hazard

• FDA: formaldehyde appears as formaldehyde, formalin, methylene glycol. Effects include eye/nose/throat irritation above ~0.1 ppm, cough, wheeze, headache, dizziness, nausea, chest pain, vomiting, rash, and sensitization. It is a human carcinogen at high or prolonged exposure. Salons fall under OSHA's formaldehyde standard (29 CFR 1910.1048), and professional products must have SDSs. FDA, updated Oct. 15, 2024
• OSHA (2011 hazard alert era): NIOSH found ~11% formaldehyde in Brazilian Blowout Acai Professional Smoothing Solution labeled formaldehyde-free, and Oregon found ~8.5% in another sample. Manufacturers must list formaldehyde on MSDS/SDS. Salons should monitor air, use controls and respirators where needed, and wear gloves. NIOSH REL is a 0.1 ppm ceiling. OSHA Background. OSHA PEL 0.75 ppm TWA, action level 0.5 ppm, STEL 2 ppm [standard values; not re-fetched].

FDA proposed ban: timeline

A 2021 petition from salon workers/advocates preceded the agenda item (HealthDay).

State laws

• California AB 2762 (signed Sept. 2020; effective Jan. 1, 2025): bans formaldehyde, paraformaldehyde, methylene glycol, quaternium-15, and more. AB 496 (signed Oct. 8, 2023; effective Jan. 1, 2027) adds 26 substances incl. lily aldehyde. CA DTSC (May 2024) declined a separate Priority Product listing for formaldehyde straighteners, citing the forthcoming FDA and state measures, and listed ~40 potential releasers. DTSC; K&H
• Maryland HB 643 (2021; Health-Gen. §21-259.2, effective Jan. 1, 2025): same four formaldehyde-related substances, with a technically-unavoidable-trace exception. A 2026 law (SB 656/HB 1533, signed Apr. 28, 2026, effective July 1, 2026) reportedly adds lead and stronger penalties (ChemLinked; Medium confidence, paywalled).
• Washington TFCA (2023): formaldehyde and methylene glycol (plus PFAS, phthalates, lead, mercury, triclosan, phenylenediamine salts) restricted from Jan. 1, 2025. WAC 173-339 (adopted Aug. 2025) restricts 25 formaldehyde releasers from Jan. 1, 2027, incl. bronopol, bronidox, DMDM hydantoin, quaternium-15, and timonacic in heat-activated straighteners. Only WA retailers may sell through pre-existing stock to Dec. 31 of the restriction year. Cosmetologists should not pour non-compliant products down drains. WA Ecology news; Guidance for cosmetologists
• Oregon and Minnesota also appear on a May 2024 Crowell chart of formaldehyde restrictions (effective dates not given). Crowell chart

Substitutes: glyoxylic acid

• ANSES (Jan. 23, 2025): glyoxylic acid "very likely responsible" for acute kidney failure. At least 5 cases (1 initial + 4 after the Oct. 2024 alert). ANSES urges EU restriction or ban and assessment of derivatives. Symptoms to watch: abdominal or lower back pain, nausea, vomiting. ANSES
• EU SCCS mandate (published ~May 2026): assess safety up to 16% in straighteners; data deadline May 5, 2027. Notes it may release formaldehyde under certain conditions. COSlaw.eu
• Israel reporting describes continued kidney-failure cases despite a ban there (Times of Israel, not fetched). A U.S. toxicology case series (PubMed 40875963) and a systematic review (PMC12754416) exist but were not accessible (captcha).

5. Chemical relaxers/straighteners and cancer research

A 2025 systematic review in the Journal of Applied Toxicology (Hernandez et al.) on relaxers and hormone-sensitive outcomes in Black women exists (Wiley) but was not accessible (403). Causation: not established.

6. MDL 3060 litigation (as of Sept. 2026)

• Court: N.D. Ill., No. 1:23-cv-00818; Judge Mary M. Rowland; Magistrate Judge Beth W. Jantz (per tracker).
• Counts (JPML): Sept. 1, 2026: 12,129 pending / 16,561 historical (JPML). Aug. 3, 2026: 11,779 pending / 16,199 total (Marin Murphy citing JPML). Trackers show ~10,948 in Jan. 2026. Note: many "resolved" actions likely reflect dismissals, duplicates or remands, not settlements.
• Defendants (May 2026 JSR): L'Oréal USA, Revlon, Luster Products, Namaste, AFAM, Beauty Bell, Strength of Nature, House of Cheatham, Sally Beauty, Avlon, Dudley Beauty, RNA Corp., John Paul Mitchell Systems, Murray's Worldwide. Revlon issues relate to its bankruptcy (a tracker cites a $44M reserve, unverified).
• Schedule (May 14, 2026 JSR): Bellwether fact discovery (10 cases) to close June 10, 2026. Combined Rule 702 general-causation motions filed May 5, 2026 (oppositions June 2, replies June 16). Class certification oppositions June 2, replies Aug. 3, 2026. State trials: St. Clair County, IL Sept. 28, 2026; Cook County Nov. 2, 2026 (then Jan. 26 and Apr. 5, 2027); DeKalb County, GA expert deadlines extended to July 17, 2026. Disputes over deficiency notices; a diversity jurisdiction issue (Beauty Bell). JSR
• Later dates (trackers, Medium confidence): Defendants' expert disclosures Sept. 3; plaintiffs' rebuttal Sept. 17; expert discovery closes Nov. 16; SJ/Daubert motions Dec. 16, 2026; first trials 2027. Mediator Ellen Reisman appointed Apr. 2025. Marin Murphy. Conflicting tracker (MDL Update) claims "initial 3 bellwether cases" selected in Sept. 2026, unverified. Projected settlement values on tracker sites are speculative and excluded.
• Rule 702 ruling: Not reported as of Sept. 17, 2026 (plaintiffs' opposition filed Aug. 3 per King Law; briefing-date inconsistency between sources).
• Arizona v. L'Oréal USA: Filed Sept. 9, 2026; announced Sept. 11. Consumer fraud / failure to disclose risks (ovarian, uterine, thyroid, pancreatic). Products named: Dark & Lovely, Optimum, Mizani (SoftSheen-Carson). L'Oréal: allegations "have neither legal nor scientific merit." AZ AG; Consumer Reports

7. MoCRA implementation status

• Enacted: Dec. 29, 2022. Most provisions effective Dec. 29, 2023. FDA enforcement of registration/listing began July 1, 2024 (EcoMundo).
• Registration/listing: Facilities renew biennially; products listed with ingredients and updated annually. 14,299 active facility registrations and 992,907 active listings as of Jan. 6, 2026 (Foley).
• Adverse events: Serious AEs within 15 business days; follow-up within 15 business days for 1 year. Public FAERS cosmetics dashboard launched Sept. 12, 2025.
• Safety substantiation: Required; no mandated methods; animal testing not required.
• Recall/records: Draft mandatory recall guidance Dec. 18, 2025; draft records access guidance Jan. 2026 (Crowell).
• GMP: Statutory NPRM deadline Dec. 29, 2024 missed. Moved to long-term actions (Spring 2025 agenda), with no NPRM expected within 12 months. Warning letter to CDL Services d/b/a Technichem (Nov. 24, 2025) cited GMP issues.
• Fragrance allergens: Statutory deadline June 29, 2024 missed. Agenda target May 2026 (Spring/Fall 2025 agendas). Industry report (July 2026): November 2026. Not published as of research date. Medium.
• Talc/asbestos testing: Proposed Dec. 26/27, 2024; withdrawn Nov. 28, 2025 (FR 2025-21407) citing scientific/technical complexities; FDA intends to reissue. MoCRA still mandates it.
• PFAS report: Published Dec. 29, 2025; insufficient data to determine safety.
• Small business exemption and exceptions, professional-use labeling wording, salon exemption, preemption scope: Described from statutory background knowledge [not re-verified in this session]. Treat as Medium confidence and verify against FDA guidance before publishing post 05 edits.
• Context for delays: FDA reorganization and staff reductions in 2025; the administration's regulatory reduction policy (Marie Gale).

8. EU Cosmetics Regulation: hair-relevant restrictions

• Framework: Regulation (EC) No 1223/2009. Annex II (prohibited), Annex III (restricted with limits/warnings), Annex IV (colorants). Since the 2003 EU hair dye strategy, industry had to submit SCCS safety dossiers or have substances banned; well over 100 hair dye substances were prohibited as a result [background; not re-verified; exact count to confirm].
• Oxidative dye warnings: See §2 (under-16 warning, black henna, "do not colour if…"). C&T
• PPD: Max 2% on-head after mixing, professional-use labeling for some substances [not re-verified].
• Lilial ban: March 1, 2022 [not re-verified].
• Glyoxylic acid: SCCS mandate 2026 (see §4).
• Formaldehyde: EU requires labeling "contains formaldehyde" when releasers yield ≥0.001% free formaldehyde in finished product (Reg. 2022/1181, applicable from July 31, 2024) [background; not re-verified].

9. Salon occupational exposures

• IARC: Vol. 57 (1993) and Vol. 99 (2010) evaluated hairdressers/barbers. Occupational exposure = Group 2A; personal use of hair colourants = Group 3 (Vol. 99). IARC Vol. 99 page; Vol. 57 summary. Classification wording not re-fetched [Medium-High].
• UK IIAC Position Paper 31 (Feb. 2014): Bladder cancer RR in hairdressers 1.2–1.7 (meta-analyses 1.30 and 1.23; a pooled EU analysis 0.8, 0.4–1.7). Below the doubling threshold, so prescription not recommended. Notes IARC 2A (1990s). IIAC. Limitation: UK compensation-threshold framing; older exposures (pre-1980 formulations with aromatic amines) likely drive risk.
• Scoping review (Quiros-Alcala et al., 2019; CDC Stacks): Salon exposures include formaldehyde (83% of Taipei salon samples exceeded Taiwan IAQ standard), VOCs (toluene, benzene, acetates), phthalates (~3x residential), persulfates, ammonia. Most consistent outcome: respiratory (rhinitis, lung function decline, airway inflammation). Reproductive evidence insufficient. Recommends ventilation, safer products, research on stylists serving Black clientele. CDC Stacks
• Occupational PPD allergy: Hairdressers were 72.8% of occupational PPD cases in NACDG (see §2).
• OSHA formaldehyde: Air monitoring, controls, PPE (see §4). OSHA
• NIOSH-specific salon ventilation guidance: Not retrieved in this session (only a 1989 HHE surfaced). Open item.

Open questions / not verified

1. Olaplex 2023 hair loss lawsuit final outcome: Not verified (fetch blocked). Post 04 states this explicitly.
2. Independent bond-builder studies: Not retrieved. Post 04 is conservative and should get peer-reviewed citations before publishing.
3. FDA formaldehyde and fragrance allergen NPRM target (Nov. 2026): From one industry blog; Reginfo.gov page text didn't render.
4. MDL 3060 Rule 702 ruling, current state trial dates (St. Clair Sept. 28, Cook Nov. 2), and whether any state trial started: Not confirmed.
5. MoCRA small-business exemption exceptions, professional-use label wording, salon exemption and preemption: Not re-verified against FDA text this session.
6. EU details (PPD 2% limit, lilial date, formaldehyde labeling threshold, number of banned hair dye substances): Background knowledge, not re-fetched.
7. AAD hair dye allergy guidance and NIOSH salon guidance: Not retrieved.
8. Maryland 2026 law (SB 656/HB 1533) contents: Paywalled; lead addition reported by ChemLinked only.
9. Glyoxylic acid U.S. case series/systematic review details: Captcha-blocked.

Source list

Research Dossier 02: Textured Hair, Inclusion, Cutting and Styling Techniques

Research date: September 17, 2026 Cluster: Textured hair, inclusion, cutting and styling techniques Scope: CROWN Act (federal, state, local, cases); state laws requiring textured-hair education in cosmetology programs and exams, and national exam (NIC) status; curl-typing systems and porosity testing; traction alopecia and CCCA (AAD and peer-reviewed guidance, no diagnosis); curly cutting methods and certification programs; silk press vs keratin/smoothing vs relaxer vs texture release, including thermal damage research and regulatory/litigation status; textured-hair market data; natural hair braiding licensing; barbering and cosmetology crossover. Method: WebSearch and WebFetch only. Several PubMed, Congress.gov, JAMA, BoF and state-legislature pages blocked automated fetching (403 / robots / CAPTCHA), and the session's web-search budget ran out before every thread could be finished. Where a primary source could not be opened, this is flagged and a secondary source is used instead, with its limits noted.

Key findings

1. Federal CROWN Act has not moved in the 119th Congress. H.R. 1638 (Rep. Bonnie Watson Coleman) and S. 751 (Sen. Cory Booker) were both introduced in February 2025. The House bill had 76 cosponsors, and its last recorded action is referral to the Judiciary and Education and Workforce committees on Feb. 26, 2025. The Economic Policy Institute reported on Aug. 6, 2026 that "neither bill has received a vote." The House passed earlier versions in 2020 (voice vote) and March 2022 (235–189), but the Senate never took them up. Confidence: High (GovInfo bill status XML; EPI, Aug 2026; Wikipedia summary of congressional record).
2. 30 states have some version of a CROWN law as of August 2026, plus Washington, D.C. EPI counts 27 full legislative laws, one executive order (Arizona) and two limited laws: Kentucky (2024, public service only) and Missouri (2025, education only). The newest full laws are Pennsylvania (HB 439, signed Nov. 25, 2025, effective Jan. 24, 2026) and Rhode Island (2025). The Official CROWN Act site also says "30 States Down, 20 To Go." Confidence: High for the count, Medium for how each limited law is characterized (EPI; thecrownact.com/about; Jackson Lewis).
3. Nine states now have laws or board mandates for textured-hair education. They are Louisiana (board action, 2021), New York (S6528, signed Nov. 2023, in effect Sept. 1, 2026), Minnesota (May 2024), Connecticut (PA 24-53, 2024), California (AB 2166, 2024), Washington, Vermont and Maine (2025), and New Jersey (P.L.2025, c.207, signed Jan. 12, 2026). Most of these laws also require the topic on licensing exams. We found no public evidence that the NIC national exam bulletins we could review have added textured-hair content. Confidence: High for LA/NY/MN/CA/WA/NJ, Medium for CT/VT/ME details, Low on NIC (absence of evidence) (NY DOS; Premium Beauty News; WRNJ).
4. Traction alopecia is common, and it can often be reversed if caught early. A 2018 review estimated it affects about one-third of women of African descent. In one South African school study, prevalence rose from 8.6% to 21.7% between the first and final school years. Risk is highest when tight braids, weaves or extensions are put on chemically relaxed hair. The AAD says pain means a style is too tight, and suggests wearing weaves or extensions "two or three months at most." CCCA is a different, scarring condition. It affects an estimated 2–7% of middle-aged women of African descent and needs early care from a dermatologist. Confidence: High (AAD hairstyles; Billero & Miteva 2018; Johns Hopkins 2016; StatPearls CCCA).
5. Chemical and heat straightening carry different risks, and federal rules have stalled. The FDA formaldehyde ban for hair smoothing products was announced in 2023 but has never been published as a proposed rule, and it missed a Dec. 31, 2025 target. The hair relaxer MDL 3060 (N.D. Ill.) had about 11,779 pending cases in August 2026, with no trials and no settlement. The NIH Sister Study found an association with uterine cancer, not proven causation. A 2025 thermal study found the hair cortex breaks down around 220–250 °C, and that chemically straightened hair starts decomposing about 25 °C earlier than untreated hair. Confidence: Medium-High (FDA; NIH; Lima et al. 2025).
6. Curl-typing charts are marketing shorthand, not science, and "porosity float tests" measure surface damage, not porosity. Stylist Andre Walker created the 1A–4C chart in the 1990s to sell a product line. L'Oréal researchers built an 8-type system from measurements of 1,442 people in 18 countries (2007). According to a chemistry PhD's analysis, the float and sink tests really reflect surface tension. Confidence: Medium-High (Wikipedia; PubMed 18078200; Lab Muffin, Jan 2026).
7. Braiding licensing: 38 states fully exempt natural hair braiders, according to the Institute for Justice (page updated Aug. 19, 2026). Ten states require a specialty license: IL, LA, MO, NJ, NY, NC, OK, OR, SC and TN. The Knee Regulatory Research Center counts licensing differently and reports 18 states plus D.C. with some natural-hair license. Confidence: Medium, because the two sources define terms differently (IJ; Knee Center, Mar 2026).
8. Curly cutting certifications are brand programs, not state licenses. Examples are the DevaCurl DevaCut (Level 1 and Level 2, each $799 full-day in-person; owned by Henkel), Ouidad Certification (2 days, licensed stylists only, prerequisite quiz) and Rëzo Academy (Levels 1–3). None of these is required by any state. Confidence: High for program structure as listed on brand sites (DevaCurl Pro; Ouidad Education; Rëzo Academy).

1. The CROWN Act

1.1 What it is

CROWN stands for "Creating a Respectful and Open World for Natural Hair." The laws add "traits historically associated with race," such as hair texture and protective hairstyles, to the legal definition of race in anti-discrimination law. Protective styles named in these laws include locs, braids, twists, coils, Bantu knots, afros and extensions. Pennsylvania's 2025 law uses this language (Jackson Lewis). Dove and the CROWN Coalition led the campaign starting in 2019. California passed the first state law that year.

1.2 Federal status (as of September 2026)

• 119th Congress: H.R. 1638, CROWN Act of 2025, was introduced Feb. 26, 2025 by Rep. Bonnie Watson Coleman (D-NJ-12) with 75 original cosponsors (76 total). It was referred to House Judiciary and Education and Workforce, and no later action is recorded (GovInfo). The Senate companion is S. 751 from Sen. Cory Booker (GovTrack S.751). EPI (Aug. 6, 2026): "Neither bill has received a vote."
• History: The House passed the bill by voice vote on Sept. 21, 2020, with no Senate vote. In the 117th Congress, a Feb. 28, 2022 House vote under suspension failed (235–188, short of two-thirds). The House then passed it 235–189 on March 18, 2022. In December 2022, Sen. Rand Paul blocked Senate action (Wikipedia, citing congressional record). The Official CROWN Act site lists 118th-Congress bills H.R. 8191 and S. 4224 (April and May 2024) (thecrownact.com/about). That same page says the House vote happened in "March 2023," which looks like an error, since the record shows March 2022.
• Related federal bill: The Texture Positive Act of 2025 was introduced by Rep. Nydia Velázquez on July 17, 2025. It would fund grants for partnerships that train cosmetology students on textured hair (Velázquez release). We could not verify any action on it after introduction.
• Assessment: We found nothing suggesting a federal CROWN Act will pass before the 119th Congress ends in January 2027. Confidence: Medium. This is an inference from no recorded action. It is not a forecast.

1.3 States (per EPI, Aug. 6, 2026)

Full legislative versions (27): Alaska (2022), Arkansas (2023), California (2019), Colorado (2020), Connecticut (2021), Delaware (2021), Illinois (2022), Louisiana (2022), Maine (2022), Maryland (2020), Massachusetts (2022), Michigan (2023), Minnesota (2023), Nebraska (2021), Nevada (2021), New Hampshire (2024), New Jersey (2019), New Mexico (2021), New York (2019), Oregon (2021), Pennsylvania (2025), Rhode Island (2025), Tennessee (2022), Texas (2023), Vermont (2024), Virginia (2020), Washington (2020). Executive order: Arizona (2023). Limited: Kentucky (2024; EPI says it covers public service only, while GovDocs describes it as an executive order), and Missouri (2025, education only). Missouri's law was signed by Gov. Mike Kehoe on July 9, 2025. It bars state-funded schools and colleges from restricting natural hairstyles "commonly associated with a particular race or origin," and still allows safety measures like hair nets (Missouri Independent). Plus Washington, D.C.

Details on recent laws:

• Pennsylvania: HB 439, signed Nov. 25, 2025, effective Jan. 24, 2026. It covers employment for employers with 4 or more employees and also protects religious head coverings (Jackson Lewis). (Pennsylvania's Human Relations Act also covers housing and public accommodations. We did not confirm whether HB 439 extends to those.)
• Rhode Island (2025): The General Assembly expanded the definition of race to include "traits historically associated with race, such as hair texture and protective hairstyles" (RI News Today session wrap-up). We could not open the bill number or effective date.
• A vendor source, GovDocs (updated July 2025), listed 27 states plus D.C. That list predates Pennsylvania, Rhode Island and Missouri.

States with no statewide CROWN law (derived by subtraction from EPI's list, so verify before publishing a map): Alabama, Florida, Georgia, Hawaii, Idaho, Indiana, Iowa, Kansas, Mississippi, Montana, North Carolina, North Dakota, Ohio, Oklahoma, South Carolina, South Dakota, Utah, West Virginia, Wisconsin, Wyoming. (Kentucky and Missouri have only partial protections.) Confidence: Medium.

1.4 Local ordinances

EPI names Charlotte, NC; Columbus, OH; and Miami Beach, FL as having local CROWN laws. Pittsburgh and St. Louis passed ordinances years before their states acted. PBS NewsHour (July 2023) reported that Kansas City passed one unanimously in 2020 and St. Louis in 2021 (PBS). GovDocs says "more than 50 cities" have them. That figure comes from a compliance vendor and could not be independently counted. Confidence: Medium for named cities, Low for the count.

1.5 Workplace and school cases and evidence

• Barbers Hill ISD (Texas): Student Darryl George was suspended in 2023 over the length of his locs, and spent most of his junior year in in-school suspension. In February 2024, a Texas state judge ruled for the district, finding that the Texas CROWN Act did not bar hair-length rules. Texas lawmakers then said they would amend the law (Houston Public Media headline, Feb. 23, 2024, article body not fetchable). Separately, a federal judge dismissed most of George's claims in 2024 and dismissed the rest with prejudice on July 24, 2025 (KPRC Click2Houston; ABC13). We could not verify whether Texas amended its CROWN Act in 2025.
• Lesson for the site: State CROWN laws protect texture and protective styles. Courts may read length, grooming and "neatness" rules differently, and the exact wording of each law matters.
• Dove/LinkedIn CROWN 2023 Workplace Research Study (JOY Collective and Modulize for Dove; survey Dec. 2022–Jan. 2023; n=2,990 women ages 25–64, including 1,039 Black women): Black women's hair was 2.5 times as likely to be perceived as unprofessional. 66% of Black women change their hair for job interviews, and 41% go from curly to straight. More than 20% of Black women ages 25–34 had been sent home from work because of their hair. About 25% believe they were denied a job interview because of their hair (PR Newswire). Limitation: commissioned by a brand that runs the CROWN campaign. The data is self-reported.
• Dove CROWN Research Study for Girls (2021): 53% of Black mothers say their daughters experienced race-based hair discrimination as early as age 5. 66% of Black children in majority-white schools report such discrimination (Dove). Same limitation, and the methodology was not shown on that page.

2. Textured-hair education laws and exams

2.1 The gap

Industry groups and lawmakers describe cosmetology programs as historically training on straight hair. New York's Secretary of State said: "Traditional cosmetology courses historically ignored textured hair, leading salons to turn away clients or undertreat Black customers" (NY DOS, Sept. 1, 2026). Rep. Velázquez's 2025 release cites a 2020 study: 86% of Black women reported trouble finding consistent salon services, and 65% of stylists wanted more textured-hair training. The study itself was not located, so the figures are unverified. The PBA and its Texture Education Collective (founded by Aveda, DevaCurl, L'Oréal USA and Neill Corporation) often say "65% of Americans have textured hair." That is an advocacy figure, and its methodology was not found.

2.2 State-by-state (as of September 2026)

• Implementation concerns (NY): Many instructors were never trained in textured hair, the law does not apply to already-licensed stylists, and it is unclear whether schools have trained staff (TheGrio).
• Illinois: Named in the research brief, but we could not verify a textured-hair education mandate. Illinois has a separate hair braiding license. A beauty apprenticeship bill was waiting for the governor's signature in June 2026 (WSIU), and we did not verify the outcome.
• New Jersey final rule adoption: Not verified.

2.3 National exam (NIC)

The NIC National Cosmetology Practical Examination Candidate Information Bulletin (effective July 1, 2022) that we reviewed specifies full-size, "minikin" or "junior" mannequins. It does not mention hair texture or curl pattern (NIC CIB mirror). The NIC FAQ page shows no textured-hair update. We found no public evidence of an NIC textured-hair content change as of September 2026, but newer bulletins may be behind a login. States with mandates (LA, CA, MN, NJ) describe state-level exam content. Confidence: Low.

3. Curl typing and porosity

3.1 Andre Walker system

Andre Walker, Oprah Winfrey's longtime stylist, created the system in the 1990s, originally to market his product line. It has Types 1 (straight), 2 (wavy), 3 (curly) and 4 (coily), each with A–C subtypes. Criticisms: it implies a hierarchy that favors looser textures, ignores density, strand width and scalp, and ignores the fact that one head often has several patterns (Wikipedia). Some dermatology literature (International Journal of Women's Dermatology) finds it useful for describing hair in clinical settings.

3.2 Measurement-based alternative

De la Mettrie et al., L'Oréal Recherche, Human Biology (2007): 1,442 people from 18 countries. The study measured curve diameter, curl index and number of waves and produced 8 shape-based types that do not rely on ethnic categories (PubMed 18078200). Limitation: industry-funded, and designed for cosmetic and forensic use.

3.3 Mintel on shifting self-identified types

Mintel's July 16, 2026 report "US Black Haircare to Textured Haircare: Expanding the Lens" says that among Black consumers, self-reported Type 4 fell below 50% while Type 1/2 rose between 2020 and 2026. It also notes that textured hair exists across racial and ethnic groups (Mintel store summary). Limitation: paywalled ($4,995), so only the public summary was read. These are self-reported types.

3.4 Porosity float test

Chemist Michelle Wong (PhD), writing on Jan. 28, 2026, explains that the float and sink tests reflect surface tension. Undamaged hair has a hydrophobic lipid layer (the F-layer, 18-MEA) and tends to float. Damaged hair wets more easily and sinks. That is a sign of surface damage, not how much water hair absorbs. Undamaged hair takes up roughly 30% of its weight in water, and damaged hair about 45% (citing Robbins). She advises stylists not to use these tests to set chemical processing times (Lab Muffin). Confidence: Medium-High. This is a science-communicator source that cites the literature. It is not a peer-reviewed study itself.

4. Traction alopecia, CCCA and protective styles (no diagnosis)

4.1 AAD guidance

From "Hairstyles that pull can lead to hair loss," last updated Nov. 6, 2024 (AAD):

• Styles that can cause traction alopecia: tight cornrows, braids and locs; tightly pulled buns, ponytails and updos; extensions and weaves (especially on relaxed hair); rollers worn nightly; tight head coverings.
• Tips: Loosen braids around the hairline. Choose thicker braids or locs. Prefer sewn-in over glued weaves, and make sure the cornrow base isn't tight. Rotate styles. Check your hairline regularly.
• Stop-signs: pain, stinging, crusting, "tenting" (skin pulled up around the hair), broken hairs around the forehead, a receding hairline. "If your hairstyle feels painful, the style is too tight."
• Weaves and extensions (AAD, undated): start with healthy hair, tell your stylist about pain or headaches, remove clip-ins before washing, protect edges, and wear extensions "two or three months at most" before taking a break.

4.2 Evidence

• Billero & Miteva, Clin Cosmet Investig Dermatol (2018): TA affects about one-third of women of African descent. Among South African schoolgirls, prevalence rose from 8.6% (first year) to 21.7% (final year). Most early cases are reversible, but continued traction leads to scarring and permanent loss. The "fringe sign" (a strip of retained hair at the hairline) helps clinicians tell TA apart from other conditions (DovePress).
• Haskin & Aguh, JAAD (2016, Johns Hopkins): braids, locs, weaves and extensions carry the highest risk, especially on chemically relaxed hair. Loose styles and hair without chemicals are lower risk. Suggestions include loosening braids every 2–3 months and removing weaves or extensions after 6–8 weeks. Aguh noted that simply telling patients to abandon helpful styles "won't work for everyone" (ScienceDaily/Johns Hopkins release; PubMed 27114262). Limitation: a narrative review. The full abstract was not fetched because of a CAPTCHA.
• The AAD and the Johns Hopkins recommendations give slightly different timelines. Content should present both as general guidance and send readers to a dermatologist.

4.3 CCCA

• AAD: a scarring hair loss seen most often in Black women but found in all groups. It usually starts in middle age at the crown as a small round patch that grows, sometimes with bumps, burning or itching. Scarred follicles cannot regrow hair, so early prescription treatment matters. OTC products are not effective (AAD CCCA).
• StatPearls (updated Mar. 13, 2024): affects about 2–7% of middle-aged women of African descent, with mean onset at 36. Relaxers, hot combs and tight styles were once blamed, but the condition occurs in women who don't use them. The cause is thought to be multifactorial, including genetics (PADI3 variant, NEJM 2019) (StatPearls). The NEJM page was not fetchable (403).
• Content rule: Stylists can notice changes and refer clients. They should not diagnose.

5. Curly cutting methods and certifications

• No independent studies were found comparing outcomes of these methods. Choosing between them is a matter of preference and the stylist's skill. Confidence: Medium (based on not finding any).
• DevaCurl context: A consolidated class action alleging scalp irritation and hair loss (In re Deva Concepts Products Liability Litigation, S.D.N.Y.) settled for $5.2 million with no admission of liability. Final approval came in January 2022 (Bloomberg Law). This concerned products, not the cutting method. Any mention should not suggest the claims were proven.
• Tension-free cutting on dry hair is the shared idea behind DevaCut and Rëzo: curls shrink unevenly when they dry, so cutting dry shows where each curl sits. Wet-cut methods like Ouidad account for shrinkage through technique. Specialist Christin Brown says both work when stylist and client are satisfied (Beauty Launchpad).

6. Silk press vs keratin/smoothing vs relaxer vs texture release

6.1 Definitions (general, textbook-level)

• Silk press: Hair is washed, deep conditioned and blow-dried, then flat-ironed in small sections with no chemical straightener. The straightness goes back to the natural pattern when hair gets wet or humid. The risk is heat damage: too much heat, too many passes, or pressing too often can permanently loosen curls.
• Keratin/smoothing treatments: Solutions are flat-ironed into the hair to reduce frizz and loosen curl for weeks to months. Some contain formaldehyde or formaldehyde releasers (formalin, methylene glycol) that release formaldehyde gas when heated (FDA, updated Oct. 15, 2024). Some "formaldehyde-free" products use glyoxylic acid (acid straightening). A 2025 study found acid-straightened hair less heat-stable (see 6.3).
• Relaxers: Alkaline chemicals permanently break and rearrange the hair's structure. "Lye" types use sodium hydroxide, and "no-lye" types typically use guanidine or calcium hydroxide. The change is permanent, so new growth needs retouching. Scalp burns are a known hazard. Confidence: Medium. This is standard cosmetology chemistry, but we could not fetch the FDA relaxer page due to rate limiting.
• Texture release / "texturizer": A salon term with no fixed definition. It usually means a relaxer-type or thio-type chemical applied for a shorter time or at lower strength to loosen curls rather than straighten fully. Chemically it is still permanent processing. Confidence: Low-Medium. No authoritative definition was found, so consumers should ask for the product name and Safety Data Sheet.

6.2 Safety, regulation and litigation status

• FDA formaldehyde ban: Listed on the Unified Agenda in spring 2023 (RIN 0910-AI83). Target dates of Oct. 2023, April 2024, Nov. 2024, March 2025, July 2025 and Dec. 31, 2025 all passed without a proposed rule being published. As of August 2026, no ban is in effect (Marin Murphy law firm tracker, Aug. 2026; CNN headline, Jan. 5, 2026; reginfo.gov). Limitation: the main detailed source is a plaintiffs' law-firm page, and CNN's body text was not fetchable.
• OSHA: Issued a hazard alert for salon workers on formaldehyde in smoothing products (updated Sept. 22, 2011) (DOL; OSHA hair salons).
• NIH Sister Study (JNCI, Oct. 17, 2022): 33,497 women followed for about 11 years, with 378 uterine cancers. Frequent use of straighteners (more than 4 times a year) was associated with about twice the risk. Estimated cumulative risk by age 70 was 4.05% for frequent users vs 1.64% for never-users. No brand or ingredient data was collected, and the authors called for more research (NIH). This is an association, not proof of causation.
• MDL 3060 (In re Hair Relaxer Marketing, Sales Practices and Products Liability Litigation, N.D. Ill., Judge Mary M. Rowland): about 11,779 pending cases as of Aug. 3, 2026. Ten bellwether cases were selected April 2, 2026, and expert discovery runs through Nov. 16, 2026. Summary judgment and expert (Rule 702) motions are due Dec. 16, 2026. No trials are set and no settlement has been announced (Marin Murphy, Sept. 2026 update). Limitation: a law-firm source. Check against the JPML pending-MDL report before publishing. Allegations are unproven.

6.3 Thermal damage research

• Lima et al., Biopolymers (2025): the hair cortex degrades significantly between 220 and 250 °C ("melts and evaporates above 230 °C"), while the cuticle holds up above 250 °C. Water evaporates from 30–150 °C. Acid-straightened hair began decomposing about 25 °C lower than untreated hair, and bleaching plus acid straightening did the most damage, with increased porosity (PMC12701549). Limitation: lab thermal analysis, not real-world flat-iron use. Sample origin not reviewed.
• Other relevant studies were identified but their abstracts could not be read (PubMed CAPTCHA and rate limits): Ruetsch & Kamath, J Cosmet Sci 2004, "Effects of thermal treatments with a curling iron on hair fiber" (PubMed 15037918); Zhou et al. 2011 on flat-ironing pretreatments (PubMed 21635854); Lima et al. 2019, "Heat-damaged evaluation of virgin hair" (PubMed 30861299); Shaw et al. 2025, a tensile-based heat damage scale (Int J Cosmet Sci). Specific temperature thresholds from these studies are not quoted, because they could not be verified.
• Practical takeaway (Medium confidence): Heat damage builds with temperature, time and repeated passes. Hair that has been relaxed, bleached or acid-straightened tolerates less heat. Many consumer flat irons reach 200–230 °C (about 390–450 °F), which overlaps the range where the cortex breaks down in lab tests.

7. Textured-hair market data

• Mintel (July 2026, paywalled): household spending on shampoo and conditioner stalled from 2019–2025. Black women use protective styles, wigs and extensions year-round. Scalp-first formulas are an opportunity (Mintel summary). A 2025 Mintel report, "US Textured Haircare and Hair Styles," also exists (Mintel).
• The Velázquez release says the textured-hair industry is "approximately $2.5 billion." The underlying source was not cited on the page.
• No public Nielsen/NielsenIQ textured-hair figures were verified. Use market figures only with attribution and "estimate" labels.

8. Braiding licensing and deregulation

• Institute for Justice (page modified Aug. 19, 2026): 38 states completely exempt natural hair braiders from cosmetology licensing. 10 require a specialty braiding license: Illinois, Louisiana, Missouri, New Jersey, New York, North Carolina, Oklahoma, Oregon, South Carolina, Tennessee. Specialty-license training "can range from several dozen to several hundred" hours (IJ). IJ's braiding issue page says 24 states required a full cosmetology or barber license for braiding when its initiative launched in 2014. It lists Wyoming (signed Feb. 28, 2025) as a recent reform (IJ braiding). Limitation: IJ is an advocacy law firm for deregulation. 38 + 10 = 48, and the status of the remaining two states and D.C. was not stated on the page.
• Pennsylvania exempted braiders in October 2024 (NBC Philadelphia called it the "34th state"). It passed unanimously in the House and 49–1 in the Senate (NBC10).
• Knee Regulatory Research Center (WVU), Mar. 6, 2026: in its 2025 database, natural hair braiders are licensed in 18 states plus D.C. Requirements range from zero experience (Iowa, Oregon) to about 1,800 hours (Hawaii). Initial fees run from $0 (Iowa, Ohio) to $420 (Alaska). Only Iowa, Missouri and Illinois waive exams (Knee Center). Limitation: counts differ from IJ, likely because Knee includes registrations and natural-hair-stylist licenses. Publish ranges with both sources, not a single number.

9. Barbering and cosmetology crossover for textured hair

• California's AB 2166 applies to barbering as well as cosmetology and hairstyling programs. Washington's 2026 rules apply to barbering and hair design (AHP; ASCP).
• New York also has a separate 300-hour Natural Hair Styling license that is now covered by the textured-hair mandate (TheGrio).
• Not verified: national data on how many barbers vs cosmetologists serve textured-hair clients, or scope-of-practice limits in each state (for example, whether barbers may do chemical relaxing or braiding). Further research is needed.

Open questions / not verified

1. Whether Texas amended its CROWN Act after the Barbers Hill ruling (2025 session).
2. Rhode Island CROWN bill number and effective date. Kentucky's legal mechanism (executive order vs statute).
3. Exact number and list of local CROWN ordinances.
4. Connecticut, Vermont and Maine bill numbers and effective dates for textured-hair education. Whether New Jersey adopted its final rules. Whether Illinois has any textured-hair education requirement.
5. Any NIC exam content changes behind login-restricted bulletins.
6. Abstracts and temperature thresholds of the 2004, 2011, 2019 and 2025 heat-damage studies (blocked).
7. Primary sources for "65% of Americans have textured hair," "$2.5 billion" and the "86% / 65%" 2020 study.
8. Public Nielsen textured-hair sales data.
9. MDL 3060 counts from the JPML directly. The FDA formaldehyde rule's current Unified Agenda date (Spring 2026 agenda).
10. How IJ and Knee Center define braider licensing, and the status of the two states IJ doesn't classify.
11. Current Texture Positive Act status.

Source list

Hair Products, Ingredients, Claims and Evidence — Research Dossier

Cluster: 03 — Products, ingredients, claims, and evidence Research date: September 17, 2026 (status statements are "as of September 2026" unless noted) Scope: Surfactants (sulfates), silicones and EU cyclosiloxane (D4/D5/D6) restrictions; "clean"/"natural"/"non-toxic" claims and U.S. state toxic-free cosmetics and PFAS laws; rosemary oil; biotin and other hair supplements (Nutrafol, collagen, marine protein); topical and low-dose oral minoxidil (information only, no medical advice); benzene in aerosol dry shampoo (recalls, petition, litigation); DevaCurl and WEN class actions; product diversion and counterfeits; viral trends (rice water, shower filters/hard water, purple shampoo, porosity); sustainability claims and the FTC Green Guides.

Method note and limitation of this pass: Research was conducted with WebSearch/WebFetch only. Late in the session the shared web-search budget was exhausted and fetches were rate-limited, so several consumer-trend topics (rice water, hard water/shower filters, purple shampoo, porosity, microplastics, counterfeit seizure data, brand anti-diversion policies) could not be independently verified with fresh primary sources. Those sections are explicitly labeled Low confidence / not verified in this pass and should be sourced before publication claims are strengthened. Nothing below is medical or legal advice.

Key findings

1. The big dry-shampoo benzene recalls were P&G (December 17, 2021) and Unilever (October 18, 2022), not a Unilever 2021 recall. P&G recalled U.S.-made aerosol dry shampoo and dry conditioner sprays under Pantene, Aussie, Herbal Essences, Waterless, Old Spice and Hair Food, saying benzene came "from the propellant" (FDA/P&G, Dec 17, 2021). Unilever recalled Dove, Nexxus, Suave, TIGI (Rockaholic, Bed Head) and TRESemmé aerosol dry shampoos produced before October 2021 (FDA/Unilever, Oct 18, 2022). Both firms said no adverse events had been reported and that daily exposure at detected levels "would not be expected to cause adverse health consequences." Unilever's separate 2021-era note: Unilever recalled two Suave aerosol antiperspirants in March/April 2022 (Unilever). Confidence: High.
2. Valisure's dry-shampoo petition (filed ~Oct 31/Nov 1, 2022) reported benzene in 103 of 148 batches (≈70%) from 34 brands, with 11 lots from 3 brands above 20 ppm and 3 lots above 100 ppm, plus high variability between sprays from the same can (Valisure, Nov 1, 2022; docket FDA-2022-P-2707). This is an independent lab with a commercial testing business; results are not FDA findings. I could not confirm a final FDA response to this petition. Confidence: High (for what Valisure reported); Low (on FDA disposition).
3. Litigation followed but has produced consumer-refund settlements, not proof of harm. Church & Dwight's Batiste/Bare settlement ($2.5M cash + up to $600K vouchers; final approval Oct 18, 2023, N.D. Ill.) included a commitment that propellant would contain ≤2 ppm benzene, with no admission of wrongdoing (AboutLawsuits). A proposed $3.625M Unilever class settlement was reportedly denied preliminary approval without prejudice in February 2026; an $850K IGK settlement was reported (Lawsuit Information Center, Aug 2026 update — plaintiff-firm site, verify against dockets). Confidence: Medium.
4. Rosemary oil evidence rests mainly on one small, 6-month, open comparison trial (Panahi et al., Skinmed 2015; 100 people with androgenetic alopecia, 50 per arm) against 2% minoxidil, not against placebo. Neither group improved at 3 months; both increased hair count at 6 months with no significant difference between groups; scalp itching was more common with minoxidil (PubMed 25842469). Later work includes a 90-person, 90-day trial of branded rosemary blends published in Cureus (June 2025) and narrative reviews (2024, 2026) that call for more research (Cureus 2025; CCID 2024; Dermatology Reports 2026). Confidence: High that evidence is limited.
5. Biotin: FDA has warned since November 28, 2017 (updated November 5, 2019; troponin device list updated June 21, 2022) that high-dose biotin can cause falsely high or low lab results, including falsely low troponin in heart-attack testing (FDA troponin page; Healio, Nov 5, 2019). Reviews in 2024 and 2026 find no good evidence that biotin grows hair in people without deficiency (Yelich et al., JCAD 2024; Moltó-Balado et al., Dermato 2026). Confidence: High.
6. Nutrafol has randomized placebo-controlled data, but the trials are small and company-involved. The 2018 JDD trial enrolled 40 women (26 active, 14 placebo); a co-author was from Nutraceutical Wellness Inc., Nutrafol's maker (JDD 2018). A 2023 JAMA Dermatology systematic review (30 studies) listed Nutrafol, Viviscal and others among supplements with "highest-quality evidence" of potential benefit while noting variable quality (Drake et al.). Unilever took a majority stake in May 2022 (Unilever). Confidence: High.
7. Low-dose oral minoxidil is an off-label, prescription use that dermatologists increasingly employ; topical minoxidil is the FDA-approved form. AAD notes topical minoxidil is FDA-approved for men and women and oral minoxidil is off-label (AAD, 2022); a 2025 review in Am J Clin Dermatol summarizes hypertrichosis (~24%), transient shedding, edema, and rare serious effects such as pericardial effusion, and lists contraindications (Ong, Li, Lipner 2025). Confidence: High.
8. EU cyclosiloxanes: D4 and D5 have been restricted to <0.1% in wash-off cosmetics since January 31, 2020 (Reg. 2018/35). Regulation (EU) 2024/1328 extends restrictions on D4, D5 and D6 to leave-on cosmetics and other consumer/professional products, with the main restriction applying from June 6, 2026 per TÜV, Intertek, CIRS and the Global Silicones Council; some summaries (ChemLinked, Certified Cosmetics) cite June 6, 2027 for certain cosmetic categories. Check the EUR-Lex text for category-specific dates. Confidence: High (2020); Medium (exact 2026 vs 2027 split by category).
9. "Clean," "non-toxic" and "natural" have no legal definition for cosmetics in U.S. federal law; the FTC polices them as ordinary advertising claims. In April 2016 the FTC settled with four companies (and sued a fifth) over "all natural"/"100% natural" claims on products containing synthetic ingredients like dimethicone and phenoxyethanol—including an "All Natural Shampoo" (FTC, Apr 12, 2016). Confidence: High.
10. State laws are now doing what "clean" labels only implied. California's Toxic-Free Cosmetics Act (AB 2762) banned 24 intentionally added substances (incl. formaldehyde, mercury, certain phthalates and 13 PFAS) from January 1, 2025; AB 496 adds 26 more from January 1, 2027 (Keller & Heckman). California AB 2771 bans intentionally added PFAS in cosmetics from January 1, 2025; Colorado, Maryland, Minnesota and Washington also took effect in 2025; Maine and Vermont in 2026; Connecticut in 2028; several more 2027–2032 (Morgan Lewis, Dec 2025). FDA's MoCRA PFAS report (Dec 29, 2025) found 51 PFAS in 1,744 formulations and said data were insufficient to determine safety for most (FDA). Confidence: High (CA dates, FDA report); Medium (multi-state table).
11. WEN and DevaCurl are the defining "hair loss from a cleansing product" class actions—both settled without admission and without a regulator establishing a cause. FDA said in July 2016 it had received 127 adverse event reports directly and that the companies had received 21,000+ complaints, but it had not determined a cause (NBC/FDA, July 2016). WEN settled for $26.25M (C.D. Cal.) (Law360 via firm site, May 2017). DevaCurl settled for $5.2M, final approval January 3, 2022 (S.D.N.Y.) (Bloomberg Law). Confidence: High.
12. Sulfates are effective cleansers that can irritate at higher concentrations and longer contact; the evidence that "sulfate-free" alone prevents color fading is thin. The Cosmetic Ingredient Review found SLS/ALS safe in rinse-off products and limited leave-on use to 1% because irritation rises with concentration and contact time (CIR). Supplier research (Solvay, 2013) found water itself, prior bleaching/perming, UV and heat all drive fading, and formulation (e.g., deposited silicones/cationic polymers) mattered (Cosmetics & Toiletries). Confidence: Medium.

1. Surfactants: sulfates vs. alternatives

What they are. Sodium lauryl sulfate (SLS), ammonium lauryl sulfate (ALS) and sodium laureth sulfate (SLES) are anionic surfactants that lift oil and dirt and create foam. "Sulfate-free" shampoos substitute other surfactants—e.g., sulfonates and olefin sulfonates, isethionates, taurates, glutamates/sarcosinates, betaines and glucosides. "Sulfate-free" does not automatically mean "mild"; some alternatives (e.g., sodium C14-16 olefin sulfonate) are also strong cleansers. (General formulation knowledge; Medium confidence.)

Irritation evidence. The CIR's 1983 safety assessment (the basis of its still-cited conclusion) found SLS and ALS "appear to be safe in formulations designed for discontinuous, brief use followed by thorough rinsing," and should not exceed 1% in leave-on products; irritation increased with concentration and duration, with patch-test irritation at roughly ≥2% (CIR alert summary; J Am Coll Toxicol 1983). The CIR also found SLS not carcinogenic in animal studies—countering persistent "sulfates cause cancer" posts. SLS is widely used in dermatology research as a model irritant for patch testing, which is why it can bother people with sensitive or eczema-prone scalps. Ethoxylation (SLES) generally reduces irritation compared with SLS, but SLES may contain trace 1,4-dioxane as a manufacturing by-product—a separate regulatory issue (New York's 1,4-dioxane limits for cosmetics; not re-verified in this pass).

Color fading. The mechanism claim—strong surfactants swell the cuticle and wash out oxidative dye molecules faster—is plausible, but public, independent head-to-head consumer data are scarce. A Solvay study published in Cosmetics & Toiletries (Bendejacq, May 30, 2013) found that water alone contributes significantly to wash-out fading; damage from bleaching then perming led to ~50% color loss after five shampoos versus ~30% in the reverse order; and adding deposited silicones (e.g., 2% dimethicone) with cationic polymers improved color retention (C&T). Limitation: supplier-sponsored lab work on hair tresses. Takeaway: wash frequency, water temperature, prior damage, UV and heat probably matter as much as the sulfate question.

Textured and curly hair. Curly and coily hair tends to be drier at the ends because sebum travels less easily down the shaft; many stylists recommend gentler cleansers or co-washing. This is largely clinical/trade consensus, not trial-based. The WEN and DevaCurl litigation (Section 8) is a reminder that "gentle/no-sulfate" cleansing products are not risk-free.

2. Silicones and buildup; EU D4/D5/D6

Function. Dimethicone, amodimethicone and similar silicones reduce friction, detangle, add shine and provide some heat and color-wash protection (see Solvay data above). Water-soluble variants (e.g., PEG-modified dimethicones) rinse easily; heavier non-volatile silicones can accumulate on hair, especially with low-lather cleansers or co-washing. Amodimethicone binds preferentially to damaged (negatively charged) areas. Independent peer-reviewed evidence on "buildup" causing damage is thin: the claim is mostly about feel (limpness, coating) rather than harm. A review in the International Journal of Trichology summarizes silicone function in conditioners (Gavazzoni Dias, 2015). Confidence: Medium.

Environmental rather than health restriction. The EU restrictions on cyclic siloxanes (D4 = octamethylcyclotetrasiloxane; D5 = decamethylcyclopentasiloxane, often labeled "cyclopentasiloxane"; D6 = dodecamethylcyclohexasiloxane) are driven by their persistence and bioaccumulation (vPvB/PBT, SVHC status), not by evidence of harm to users of hair products.

• Commission Regulation (EU) 2018/35: D4 and D5 ≥0.1% w/w banned in wash-off cosmetics placed on the market after January 31, 2020 (Cosmetics & Toiletries; Global Silicones Council).
• Commission Regulation (EU) 2024/1328 (published May 16–17, 2024, amending REACH Annex XVII entry 70): D4, D5, D6 ≥0.1% w/w restricted in leave-on cosmetics and other consumer/professional products (dry cleaning, waxes, polishes, washing/cleaning products), applying "after 6 June 2026," with derogations (e.g., D5/D6 in scar/wound/stoma care devices; D5 in closed dry-cleaning systems) (Intertek; TÜV Rheinland; CIRS). ChemLinked and Certified Cosmetics describe a transitional date of June 6, 2027 for leave-on/D6 rinse-off cosmetics (ChemLinked; Certified Cosmetics). Unresolved: sources disagree on whether all leave-on cosmetics were covered from June 2026 or given until June 2027; consult EUR-Lex 2024/1328 before publishing a single date. As of September 2026, at least the June 6, 2026 restriction is in application for covered categories.
• Omnibus VII (Reg. (EU) 2025/877) added 22 CMR substances to the cosmetics ban list from September 1, 2025 (Obelis); I could not confirm whether D4 is on that list in this pass.

Practical meaning for U.S. consumers: U.S. law does not restrict D4/D5 in cosmetics; multinational brands often reformulate globally. "Silicone-free" is a preference claim, not a safety claim.

3. "Clean," "natural," "non-toxic" and the law

• No federal definition. Neither the FD&C Act nor MoCRA (2022) defines "clean," "non-toxic," "natural" or "salon-exclusive" for cosmetics (FDA MoCRA page). Retailer programs (e.g., "Clean at Sephora," "Conscious Beauty at Ulta") are private standards that mainly list excluded ingredients.
• FTC stance. Under Section 5 of the FTC Act, claims must be truthful and substantiated. The April 12, 2016 actions targeted Trans-India Products (ShiKai), Erickson Marketing Group (Rocky Mountain Sunscreen), ABS Consumer Products (EDEN BodyWorks—"Jojoba Monoi All Natural Shampoo," "Coconut Shea All Natural Styling Elixir"), Beyond Coastal, and California Naturel; the products contained synthetic ingredients such as dimethicone, polyquaternium-7/-37, phenoxyethanol and caprylyl glycol (FTC press release; FTC business blog). "Non-toxic" is problematic because toxicity depends on dose and exposure; private class actions over "clean"/"non-toxic" claims have grown (Duane Morris).
• State toxic-free cosmetics laws.
  • California AB 2762 (Toxic-Free Cosmetics Act, 2020): bans 24 intentionally added ingredients from January 1, 2025, including formaldehyde, paraformaldehyde, mercury, dibutyl/diethylhexyl phthalate, isobutyl-/isopropylparaben, m- and o-phenylenediamine and 13 PFAS; trace impurities that are technically unavoidable are allowed. AB 496 (signed October 8, 2023) adds 26 more (e.g., styrene, acetaldehyde, sodium perborate) from January 1, 2027 (Keller & Heckman; Sheppard Mullin). Hair products are within scope.
  • Washington Toxic-Free Cosmetics Act (HB 1047, 2023): restrictions on intentionally added formaldehyde and other chemical classes from January 1, 2025; Ecology's rule (August 28, 2025) restricts 25 formaldehyde-releasing chemicals from January 1, 2027, with retail sell-through to December 31, 2027; hair treatments and shampoos, and occupational exposure of stylists, were cited (WA Ecology).
• Formaldehyde straighteners are covered in a separate cluster; FDA's proposed federal ban has been repeatedly delayed (not re-verified here).

4. PFAS and microplastics

• FDA MoCRA report (December 29, 2025): 51 PFAS identified in 1,744 cosmetic formulations; FDA assessed the 25 most-used (≈96% of intentional use), found 5 of low concern, 1 with potential concern and significant uncertainty, and insufficient data for most (FDA press release; Covington). No federal ban followed as of this research (Medium confidence).
• State PFAS cosmetics bans (intentionally added PFAS unless noted) per Morgan Lewis (Dec 2025) and Holland & Knight (Aug 2025):
  • January 1, 2025: California (AB 2771), Colorado (HB 22-1345), Maryland (HB 643), Minnesota (Amara's Law, HF 2310; rules finalized December 8, 2025), Washington (HB 1047; "intentionally added" definition from 2027).
  • January 1, 2026: Maine, Vermont (S.25).
  • Connecticut: labeling/notification July 1, 2026; prohibition January 1, 2028.
  • 2027: New Hampshire, New Jersey, Oregon, Rhode Island; 2028: New Mexico; 2032: Illinois (dates as summarized by Morgan Lewis; verify statutes).
  • Where PFAS show up in hair care: some styling, anti-frizz and heat-protectant products (e.g., "PTFE," "perfluoro-/polyfluoro-" INCI names). Check labels for "fluoro" terms (Medium confidence).
• EU: A universal PFAS restriction under REACH remains at proposal stage (as of sources reviewed); intentionally added microplastics restriction (Reg. (EU) 2023/2055) has phased deadlines for rinse-off (2027) and leave-on (2029) cosmetics—not re-verified in this pass; Low confidence.

5. Rosemary oil

The 2015 trial. Panahi Y, Taghizadeh M, Marzony ET, Sahebkar A. "Rosemary oil vs minoxidil 2% for the treatment of androgenetic alopecia: a randomized comparative trial." Skinmed 2015;13(1):15–21 (PubMed 25842469).

• Design: 100 patients with AGA randomized to rosemary oil (n=50) or minoxidil 2% (n=50) for 6 months; microphotographic hair counts at 0, 3 and 6 months.
• Results: no significant change at 3 months in either group; both significant increases at 6 months vs baseline; no significant between-group difference; scalp itching increased in both and was more frequent with minoxidil.
• Limitations (from abstract and design): no placebo arm (so "no difference" cannot show either worked beyond natural variation or regression); the comparator was the lower-strength 2% minoxidil; non-inferiority not formally established; small sample; abstract does not specify blinding, rosemary preparation/concentration details, sex distribution or effect sizes; single study from one research group; not replicated at scale. Early-2020s social media often describes the result as "rosemary works as well as minoxidil," which overstates it. Later evidence.
• Patel M et al., Cureus, June 13, 2025: 90 participants, 90 days, three arms—rosemary-lavender oil, rosemary-castor oil, coconut-oil control; reported ~58% and ~48% increases in hair growth rate and improvements in thickness/density (Cureus; Tressless summary). Limitations: trademarked product (PDF hosted by Novobliss, suggesting commercial involvement—funding not confirmed in this pass), short duration, blends make it impossible to isolate rosemary, Cureus is a fast-review open-access journal.
• Bin Rubaian et al., Clinical, Cosmetic and Investigational Dermatology, Nov 5, 2024: narrative review; says finasteride and minoxidil are the only FDA-approved AGA drugs and further research is needed on herbals (PMC11549889).
• Almutairi et al., Dermatology Reports, Feb 2, 2026: narrative review; calls rosemary leaf extract a possible alternative but emphasizes need for mechanistic and long-term data (Dermatology Reports).
• Preclinical: mouse studies of rosemary leaf extract (e.g., anti-androgen/5α-reductase activity) are often cited; not re-fetched here. Safety: Essential oils can cause irritant or allergic contact dermatitis, especially undiluted; people with scalp conditions should consult a dermatologist. Overall confidence: High that evidence is preliminary; Low for any specific efficacy magnitude.

6. Biotin

• FDA safety communication. Issued November 28, 2017; updated November 5, 2019, noting continued adverse event reports and at least one death linked to falsely low troponin (the death figure appears in FDA's 2019 update per contemporaneous coverage; the fetched Healio summary did not restate it—treat as Medium). FDA's troponin assay page (last updated June 21, 2022) lists 18 cleared troponin devices still susceptible to interference (FDA). Hair/skin/nail supplements can contain biotin up to ~650 times the daily recommended intake (Healio). Affected tests can include thyroid, hormone and cardiac immunoassays that use biotin–streptavidin chemistry. Advice: tell clinicians and the lab about any biotin before bloodwork.
• Efficacy. Patel, Swink & Castelo-Soccio, Skin Appendage Disorders 2017, found reported benefit only in people with underlying deficiency or specific conditions (Karger). Yelich et al. (JCAD, August 2024) found only three eligible studies; the best (double-blind, placebo-controlled) showed "no difference" (PubMed 39148962). Moltó-Balado et al. (Dermato, May 4, 2026), 10 studies: biotin monotherapy "did not show consistent benefit" and is not supported without documented deficiency (MDPI). AAD: vitamins only if a deficiency is confirmed (AAD). Confidence: High.

7. Other supplements: Nutrafol, marine protein (Viviscal), collagen

• Nutrafol. Ablon G, Kogan S. J Drugs Dermatol May 2018: 6-month RCT in 40 women with self-perceived thinning (26 active, 14 placebo); reported significant increases in terminal and vellus hair counts at days 90 and 180 (P<0.009) (JDD). Co-author Kogan was affiliated with Nutraceutical Wellness Inc. (Nutrafol's company). Later trials include menopausal women (JDD 2021) and a single-blind, diverse-ethnicity study of men and women (PubMed 35309272); both company-associated (details not re-fetched). Unilever acquired a majority stake on May 30, 2022 (previously 13.2% via Unilever Ventures); marketing claims "#1 dermatologist recommended hair growth brand" based on an IQVIA survey (Unilever). Nutrafol is a dietary supplement—not FDA-approved to treat hair loss.
• Systematic review. Drake L et al., JAMA Dermatology 2023;159(1):79–86 (online Nov 30, 2022): 30 studies (17 RCTs), people without known deficiency; highest-quality evidence suggested potential benefit for Viviscal (marine protein complex), Nourkrin, Nutrafol, Lambdapil, Pantogar, capsaicin/isoflavone, omega-3/6 with antioxidants, apple nutraceutical, total glucosides of paeony/compound glycyrrhizin, zinc, tocotrienol and pumpkin seed oil; adverse effects rare and mild; recommends shared decision-making (JAMA Derm; MedicalXpress). Note: many included trials were manufacturer-funded; some multi-ingredient supplements contain biotin, vitamin A or selenium that can be harmful in excess. Confidence: High.
• Collagen. Evidence specific to collagen peptides for hair growth is sparse; one 3-month assessor-blinded randomized study tested a combined supplement (amino acids, iron, selenium, marine hydrolyzed collagen), so collagen's own effect can't be isolated (Milani et al., Skin Res Technol 2023). Confidence: Medium that evidence is weak.

8. Minoxidil and low-dose oral minoxidil (LDOM) — information, not advice

• Topical minoxidil (2% and 5%) is FDA-approved OTC for hereditary hair loss; results usually need months of consistent use and stopping typically reverses gains (AAD). Oral finasteride is approved for men; spironolactone is used off-label in women.
• LDOM: originally a blood-pressure drug (with boxed warnings at antihypertensive doses); used off-label in much lower doses for AGA, telogen effluvium and other alopecias. A 2025 Am J Clin Dermatol review (Ong, Li, Lipner; published Oct 21, 2025) reports comparable efficacy to topical with better adherence, hypertrichosis ~24% (dose-dependent), transient shedding 16–22%, mild peripheral edema ~2%, rare pericardial effusion; contraindications include pericardial disease, uncontrolled hypertension and pregnancy (Springer). A multicenter JAAD study of 1,404 patients (Vañó-Galván et al., 2024) is widely cited on safety (JAAD); JAAD also published 2025 "summation and recommendations" on topical and oral minoxidil (JAAD 2025). Mainstream media coverage from about 2022 onward helped popularize LDOM (specific articles not re-verified in this pass). Posts must not give dosing; direct readers to a board-certified dermatologist.

9. Benzene in aerosol dry shampoo

Why it happened. Benzene is not an ingredient. The companies attributed it to contaminated hydrocarbon propellants (butane/isobutane/propane) used to spray the product. Benzene is a known human carcinogen (IARC Group 1) linked to leukemia and other blood disorders; risk depends on dose and duration. Timeline.

• 2021 (May–Nov): Valisure petitions on benzene in sunscreens and body sprays; P&G recalls Old Spice and Secret aerosol antiperspirants (November 2021, per Cosmetics & Toiletries).
• December 17, 2021: P&G recalls aerosol dry conditioner and dry shampoo sprays (Pantene, Aussie, Herbal Essences, Waterless, Old Spice, Hair Food), ~2 dozen SKUs; consumers check the first four digits of the production code on the can bottom against P&G tables; reimbursement via brand websites or 1-888-674-3631 (FDA; Herbal Essences recall page).
• March 31–April 1, 2022: Unilever recalls two Suave 24-Hour Protection aerosol antiperspirants (Unilever; NPR).
• October 18, 2022: Unilever recalls select aerosol dry shampoos (Dove, Nexxus, Suave, TIGI Rockaholic and Bed Head, TRESemmé) made before October 2021; UPC list and reimbursement at UnileverRecall.com or (877) 270-7412 (FDA).
• October 31/November 1, 2022: Valisure Citizen Petition #7 on dry shampoo (148 batches, 34 brands, 70% with detectable benzene; 3 lots >100 ppm) (Valisure). Poison Control summarizes that samples from some lots of Not Your Mother's, Sun Bum, OGX, Batiste and Paul Mitchell tested positive while other samples from the same brands did not, and that "there is no evidence that occasional use of dry shampoo is harmful" (Poison Control).
• 2023: Batiste/Bare class settlement final approval October 18, 2023 (≤2 ppm benzene propellant commitment; no admission). Whether Church & Dwight issued a formal recall is not confirmed—AboutLawsuits says so, but the Poison Control and FDA sources reviewed list no Batiste recall; treat as unverified.
• 2024: Paul Mitchell benzene class claims dismissed (September 2024) for failure to tie purchased bottles to contaminated batches (Lawsuit Information Center); IGK settlement ($850K) for purchases before April 23, 2024.
• February 2026: Unilever proposed $3.625M class settlement denied preliminary approval without prejudice (reported by plaintiff-firm site; Medium).
• Later recalls: I could not confirm any new dry shampoo benzene recall in 2024–2026 in FDA's database during this pass (search budget exhausted). FDA's benzene guidance for drugs sets a 2 ppm limit where benzene use is unavoidable (FDA drug FAQ); cosmetics have no specific numeric benzene limit in U.S. law. MoCRA (effective Dec 29, 2023 for many provisions) gave FDA mandatory recall authority for cosmetics. How to check products: find the brand recall page (P&G production codes; Unilever UPCs), search FDA's Recalls, Market Withdrawals & Safety Alerts database, and check the purchase/manufacture date; consider non-aerosol (powder) dry shampoos if concerned; use aerosols in ventilated areas. Salon professionals using aerosols all day have higher cumulative exposure than consumers (see occupational cluster).

10. DevaCurl and WEN

• WEN by Chaz Dean (Guthy-Renker): FDA opened an investigation (publicized July 19, 2016) after 127 direct adverse event reports—the most FDA had received for a hair-cleansing product—and companies' reports of 21,000+ consumer complaints of hair loss, breakage, itching and rash; FDA had "not yet determined a possible cause" (NBC Washington). Class action in C.D. Cal. (Judge Otis D. Wright II) settled for $26.25M covering purchases Nov 1, 2007–Aug 1, 2016; $25 flat claims or up to $20,000 for documented injury; defendants denied liability (firm-posted Law360, May 2, 2017; Wikipedia). The episode fed calls for FDA mandatory recall authority, ultimately enacted in MoCRA 2022.
• DevaCurl (Deva Concepts; owned by Henkel since 2019): In re Deva Concepts Products Liability Litigation (S.D.N.Y., Judge Gregory H. Woods). $5.2M settlement; final approval January 3, 2022; class of U.S. purchasers/users Feb 8, 2008–Aug 29, 2021; Tier 1 up to $20 without proof; Tier 2 up to $18,000 plus $1,000 expenses with medical/photo documentation; 54,000+ claims; denial of wrongdoing (Bloomberg Law; Top Class Actions). Do not state that either product was proven to cause hair loss.

11. Product diversion and counterfeits — Low confidence / partially verified

• Definition: "Diversion" is when professional-only products reach unauthorized retailers (drugstores, discount sites, third-party marketplace sellers) outside the brand's salon distribution agreements. Brands including Redken, Biolage, OPI, amika and SalonCentric publish anti-diversion policies stating they cannot guarantee authenticity, freshness or safety of products sold outside authorized channels (Redken; Biolage; OPI; amika; SalonCentric) — these pages were identified by search but could not be fetched in this pass, so their exact wording is not quoted.
• Risks commonly cited: old or heat-exposed stock, tampered or refilled bottles, removed batch codes (to prevent tracing), counterfeits with unknown ingredients.
• MoCRA relevance: labels must (from Dec 29, 2024 under MoCRA as enacted) include a U.S. domestic address/phone/website for adverse event reporting; missing responsible-person contact info is a red flag (MoCRA labeling timing not re-verified in this pass; Medium).
• Data gaps: I could not retrieve U.S. CBP seizure statistics for counterfeit cosmetics or brand-specific counterfeit lawsuits for hair care in this pass.

12. Viral trends — Low confidence / not verified in this pass

The following summarize widely reported research that I could not re-fetch in this session; blog post 16 labels these as limited evidence and avoids specific figures that were not verified.

• Rice water: Studies commonly cited are small lab/tress studies on inositol and rice-water fractions (e.g., Inamasu et al., IFSCC 2010) — no robust human clinical trials of DIY fermented rice water for growth identified. Plausible benefits: temporary surface smoothing; risks: protein/starch buildup feel, scalp irritation, bacterial growth in long-fermented batches.
• Scalp oiling: Coconut oil pre-wash reduces protein loss in lab studies on hair fibers (Rele & Mohile, J Cosmet Sci 2003 — not re-verified). Heavy oiling may aggravate seborrheic dermatitis because Malassezia yeast metabolize some oils (dermatology consensus; not re-verified).
• Hard water / shower filters: Small studies (e.g., in International Journal of Trichology) on hard vs distilled water show mixed results for hair strength; minerals (calcium, magnesium, copper, iron) can deposit on hair and affect color and feel; independent evidence that consumer vitamin-C/KDF shower filters meaningfully change hair outcomes is lacking. Chlorine removal claims vary by filter certification (NSF/ANSI standards).
• Purple shampoo: Uses violet dyes to neutralize yellow (color theory); it's a deposit-only toner effect that washes out; overuse can leave lilac tint on porous blonde/gray hair. Not a "strengthening" product.
• Porosity & protein–moisture balance: Porosity (cuticle condition and water uptake) is measurable in labs; the popular "float test" is unreliable (surface tension, oils and products affect it). "Protein overload" is a stylist-community concept with little formal research; bleached/relaxed hair does lose protein (keratin damage) and benefits from conditioning.
• Bond-builders (e.g., maleic acid, bis-aminopropyl diglycol dimaleate) — covered in another cluster.

13. Refill, waterless and sustainability claims

• FTC Green Guides (16 C.F.R. Part 260) were last revised in 2012; the FTC requested comment on updates in December 2022 and held a recyclability workshop in May 2023; as of February 2025 FTC said it had "nothing new to share" (Packaging Dive). I could not confirm any final revised Green Guides as of September 2026 (Low confidence on current status; appears still pending).
• Guides' principles: avoid unqualified general claims ("eco-friendly," "green"); "recyclable" requires substantial majority (60%) access to recycling; "compostable" and "degradable" require competent evidence; qualify refill and "plastic-free" claims.
• California SB 343 (2021) restricts use of the chasing-arrows/recyclable claims unless materials meet CalRecycle criteria; implementation runs 18 months after CalRecycle's material characterization report (expected 2025) (Packaging Dive). Exact compliance date not re-verified.
• "Waterless" products (bars, powders) reduce shipping weight but lifecycle-assessment evidence is product-specific. Refill schemes help only if refills are actually used; independent LCAs are rare.
• EU Empowering Consumers for the Green Transition Directive (2024/825) bans generic environmental claims from September 27, 2026 (not re-verified in this pass; Medium).

Open questions / couldn't verify

1. Exact category split between June 6, 2026 and June 6, 2027 under Reg. (EU) 2024/1328 for leave-on cosmetics; whether D4 is on the Omnibus VII Annex II list.
2. FDA's formal response (if any) to Valisure's dry shampoo petition FDA-2022-P-2707.
3. Any dry-shampoo benzene recall after October 2022 (none found, but search could not be completed).
4. Whether Batiste was formally recalled (conflicting secondary sources).
5. Status of the Unilever dry-shampoo class settlement after February 2026.
6. Funding/sponsor of the 2025 Cureus rosemary trial.
7. Current status of FTC Green Guides revision.
8. Primary sources for rice water, hard water, porosity, oiling and purple shampoo evidence; CBP counterfeit cosmetic seizure data; brand anti-diversion policy wording.
9. EU microplastics restriction deadlines for cosmetics and the EU green-claims directive date.

Source list

Research Dossier 04 — Hot Tools, Salon Technology, AI, and Stylist Occupational Health

Research date: September 17, 2026 Cluster: Hot tools and heat-damage science; premium dryers/irons/multi-stylers (specs, prices, counterfeits, recalls); salon booking/management software (pricing, fees, data ownership, controversies); AI in salons; stylist occupational health (MSDs, dermatitis, respiratory, ergonomics). Feeds blog posts: 17–21.

Method and important limitation: Research used WebSearch and WebFetch only. Partway through, the session hit its WebSearch budget (200 calls, shared) and WebFetch returned repeated HTTP 429 rate-limit errors that didn't clear after several waits of up to 5 minutes. PubMed/PMC pages also returned reCAPTCHA pages. As a result:

• Sections 1–3 (heat science, tools, software) rest mostly on primary pages fetched on Sept 17, 2026.
• Sections 4–5 (AI, occupational health) rest partly on sources confirmed to exist (titles and URLs seen in search results) but not re-read, plus background knowledge. Those items are labeled [NOT RE-VERIFIED] and should be checked before publication.

Key findings

1. Heat damage depends on temperature, time, passes and moisture, not maximum temperature alone. TRI Princeton's review lists water loss at 50–120°C, protein oxidation and cross-linking at 120–200°C, about 180°C as a practical styling range, and keratin denaturation and pyrolysis at 200°C and above for dry hair. Wet hair is damaged from about 160°C. (TRI Princeton, Dec 2023/Jan 2024). Confidence: Medium-High (independent nonprofit lab summary of the literature; thresholds come from lab tests on sample hair).
2. Lee et al. 2011 (Annals of Dermatology): After 30 cycles, drying at 15 cm (47°C, 60 s) with motion caused less overall damage than air-drying. Cuticle damage rose with heat (worst at 5 cm/95°C). The cortex was undamaged in all groups. Cell membrane complex damage appeared only in the air-dried group. (KoreaMed Synapse). Confidence: High that this is what the study reports. Medium for real-world generalization (lab hair samples, one author affiliated with Aekyung Industrial).
3. Heat protectants give partial, lab-measured protection. Polymer pretreatments reduced breakage and preserved keratin structure at 232°C (Zhou et al., J Cosmet Sci 2011). Pretreatments reduced tryptophan loss by 10–20% at 132–152°C (McMullen & Jachowicz 1998). Confidence: Medium-High (industry-affiliated authors; lab endpoints).
4. Wet hair plus high heat causes "bubble hair," which is reproducible in all hair given enough heat (Detwiler et al., JAAD 1994). Confidence: High.
5. Premium tool prices (official US sites, Sept 17, 2026): Dyson Airwrap Co-anda2x $749.99 (launched at $699.99 in July 2025); Supersonic r $549.99; Supersonic Nural $349.99 sale; Supersonic Travel $299.99 (launched Apr 21, 2026); ghd Speed $429, Helios $329, Sculpt $449, Chronos $359; BaBylissPRO Falco $249.99; Shark FlexStyle HD430 $349.99; Laifen Swift $139.99–$169.99; Harry Josh Pro Dryer 2000 $280; T3 AireLuxe $224.99. Confidence: High for prices on that date. They change often.
6. Counterfeits are a documented safety issue. Dyson reports a Jan 19, 2026 Guangdong raid seizing 22,000 counterfeit finished products (including Supersonic and Airwrap), 30,000 accessories, 250,000+ packaging items, 36 machines, and 30 people detained (Dyson). A UK OPSS notice (Dec 24, 2025) flagged a fake Supersonic with a non-BS 1363 plug, "high risk of electric shock," a non-conforming fuse, and a misspelled warning (Bromley Council leaflet). Confidence: High (brand press release plus regulator notice).
7. CPSC hair-tool recalls are ongoing: Bio Ionic long-barrel curling iron (Oct 23, 2025; ~357,000 units; 258 barrel detachments; 6 minor burns); Remington D3190DCDN dryer (Aug 14, 2025; ~56,300; no immersion protection); Wantefully dryer brushes (Sept 10, 2026; ~2,295). Also multiple CPSC warnings about marketplace dryer brushes (Crasts, Apoke 2025; Wish.com dryers 2026). Confidence: High.
8. In salon software, processing and marketplace fees usually outweigh subscriptions. Fresha charges a 20% new-marketplace-client commission (min $6) and Booksy Boost 30% of the first visit. Vagaro's in-person rates are 2.6% + $0.10 (<$4k/mo) or 2.29% + $0.19 (>$4k/mo, +$10/mo) as of Jul 1, 2026. GlossGenius is a flat 2.6%. Confidence: High (official pages).
9. Fresha now charges subscriptions ($19.95 solo; $14.95 per team member). Competitor sources date the end of its free plan to 2025 and report owner backlash. Confidence: High on current pricing. Low-Medium on the timeline (competitor-authored; no official announcement found).
10. AI receptionists are shipping as add-ons: Vagaro "Vera Receptionist" $10–$15/mo; Fresha AI Concierge $99.95/location/mo, with an AI Receptionist announced for early 2026; Zenoti AI Receptionist requires its "AI Plus" package. Confidence: High that these are listed. No independent outcome data found.
11. Stylist MSDs and dermatitis are well documented but prevention evidence is thin. A 2019 scoping review (Kozak et al., JOMT) covers MSD burden, risk factors and the scarcity of intervention research. Confidence: Medium [NOT RE-VERIFIED full text]. Hairdressers are among the highest-risk occupations for occupational contact dermatitis in European registry research. Confidence: Medium-High [NOT RE-VERIFIED specific figures].

1. Hair heat-damage science

1.1 Structure and mechanisms

• Hair cortex keratin is held by disulfide bonds (stable), plus hydrogen and salt bonds that water and heat reset. Heat styling works by temporarily resetting hydrogen bonds.
• TRI Princeton ("Hair Heat Protection Claim Support 101," Dec 4, 2023; updated Jan 9, 2024) gives these temperature bands for dry hair:
  • 50–120°C: water loss
  • 120–200°C: chemical cross-linking and protein oxidation (yellowing)
  • ~180°C: practical styling temperature. The TRI article attributes this to Popescu's work and says damage increases above it
  • ≥200°C: keratin denaturation, pyrolysis, charring, roughness. Straighteners above 200°C cause "irreversible mechanical damage"
  • Wet hair: damage begins around 160°C. Mechanisms include cuticle cracking as the drying cuticle stretches over a swollen cortex, steam bursting out of the cuticle (bubbles), and breakdown inside the cortex and medulla.
  • Test methods: DSC (differential scanning calorimetry: very sensitive, measures shifts in keratin denaturation temperature, mostly yes/no) and automated repeated grooming (breakage counts, which support quantitative consumer claims).
  • Protection mechanisms: water's heat capacity (4181 J/kg·K), polymer films and fiber bundling that change heat transfer, and conditioning.
• DSC caveat: Popescu (2016, Int J Cosmet Sci) "DSC of human hair: a tool for claim support or incorrect data analysis?" warns about misreading DSC data in claims (Wiley). Abstract not fetched (403).
• Industry-standard heat damage scale: Shaw et al. 2025 (Int J Cosmet Sci) proposed a scale based on single-fiber tensile tests (Wiley). Abstract blocked (403). [NOT RE-VERIFIED details]

1.2 Key studies

Lee Y, Kim YD, Hyun HJ, Pi LQ, Jin X, Lee WS. "Hair Shaft Damage from Heat and Drying Time of Hair Dryer." Ann Dermatol 2011;23(4):455–462.

• Sample: untreated hair from De Meo Brothers (NY), 20 cm, 2 g per sample.
• Groups (30 cycles over 30 days): A untreated; B shampoo + air dry at 20°C; C dryer at 15 cm (47°C, 60 s); D 10 cm (61°C, 30 s); E 5 cm (95°C, 15 s).
• Results:
  • Cuticle: longitudinal cracks already at 47°C, worsening with heat. At 95°C, "many cracks, holes, and hazy cuticle borders."
  • Cortex: no damage in any group.
  • Cell membrane complex (CMC): damaged only in the air-dried group.
  • Moisture: lower in all treated groups vs control, with no significant difference between treated groups.
• Conclusion: a dryer "at a distance of 15 cm with continuous motion causes less damage than drying hair naturally."
• Limitation: in vitro, single hair source, small, and one industry affiliation (Aekyung Industrial Inc.).

Zhou Y, Rigoletto R, Koelmel D, et al. J Cosmet Sci 2011;62(2):265–282.

• Flat ironing at 232°C, 12-minute treatment schedule.
• Pretreatments: VP/acrylates/lauryl methacrylate copolymer, polyquaternium-55, PVM/MA copolymer + polyquaternium-28 polyelectrolyte complex, hydroxyethylcellulose.
• Untreated hair: α-helix to β-sheet conversion (denaturation) and more combing breakage.
• Pretreated hair: less breakage and preserved keratin, via moisture retention and better cuticle integrity.
• Limitation: authors from an ingredient supplier (ISP/Ashland lineage). [affiliation from background knowledge — verify]

McMullen R, Jachowicz J. "Thermal degradation of hair. II." J Cosmet Sci 1998;49(4):245–256 (International Specialty Products).

• Curling iron at 132°C and 152°C for 4–12 min.
• Cationic polymer, protein hydrolysate and cationic surfactant (1% solutions) reduced tryptophan decomposition by 10–20%.
• Polymer and surfactant pretreatments suppressed the rise in combing force. Stiffness increased in treated and untreated hair alike.

Detwiler SP, et al. JAAD 1994;30(1):54–60.

• Bubble hair case from an overheating dryer, reproduced in hair from 17 subjects. "No person's hair failed to develop bubbles when subjected to sufficient heat." The cavities contained gas.
• Related: "Bubble hair and other acquired hair shaft anomalies due to hot ironing on wet hair" (PubMed 22223976; abstract blocked). A 2025 PMC case report describes bubble hair from a bathroom heating lamp (PMC12202258; not fetched).

Hahn J. Purdue PhD dissertation, 2018.

• Empirical models of flat-iron temperature, glide speed, passes and exposure time vs fatigue strength reduction, straightening efficacy and permanent curl loss (motivated by curly hair). Also studied heat protectant effects, and measured thermal diffusivity with IR thermography.
• Limitation: dissertation (not peer-reviewed journal); quantitative outputs not extracted.

Centini M, et al. Cosmetics 2025;12(6):249 (Nov 7, 2025).

• Flat iron at 200°C for 5 and 10 cycles. A rice germ oil (GX-N) mask kept FT-IR spectra close to virgin hair. Ferulic acid 0.1% added nothing.
• Limitation: materials supplied by Unicosmesi and Tsuno Rice Fine Chemicals; FT-IR endpoints.

Non-peer-reviewed, excluded from posts: Andrusenko H., Zenodo, Feb 2, 2026, "expert-based protocol." This is a self-published preprint.

1.3 Guidance

• AAD ("How to stop damaging your hair," n.d.): use the lowest heat setting; limit contact time for hot combs and curling irons; use heat tools "once a week or even less often"; air-dry when possible. Note that this sits in mild tension with Lee 2011 on blow-drying vs air-drying.
• Brand positions: ghd says all US irons run at 365°F/185°C, "research shows is the optimal temperature." Wella Company's Chronos Max release (Feb 3, 2025) bases claims on its own lab and consumer testing (112 participants, Nov 2023) and a "2x more breakage protection versus competitor stylers at 235°C" claim.

1.4 Evidence gaps

• There's no independent standard "safe temperature" by hair type.
• Most samples are untreated, often Caucasian hair. There's little data on coily hair under silk-press conditions.
• Retail protectant head-to-head studies are rare, and much research is supplier-funded.

2. Premium dryers, irons and multi-stylers

2.1 Official prices and specs (US sites, accessed Sept 17, 2026)

Dyson (dyson.com)

• Supersonic Nural: $349.99 (shown as $50 off $399.99). Note: Nural launched in 2024 at a higher price. [launch price NOT RE-VERIFIED] Marketed "auto-adapts… protect scalp health."
• Supersonic (3 attachments): $279.99 promo (list $399.99).
• Supersonic r: $549.99. "30% smaller and 20% lighter," 10 heater foils, RFID attachments, 2-year warranty. Wattage and weight not on page.
• Supersonic Travel: $299.99, launched Apr 21, 2026 (PR Newswire). 32% smaller and 25% lighter than Supersonic; universal voltage; measures temperature 100x/sec; ships with styling concentrator (diffuser etc. sold separately); compatible with Supersonic/Nural attachments.
• Airwrap Co-anda2x (Straight+Wavy, Ceramic Pink/Rose Gold): $749.99, out of stock that day. 1,700 W; 13.3 L/s airflow; 0.9 lb; 4 heat/3 speed; 6.55 ft cable; 120 V; 2-year warranty. Attachments: conical and 1.6" barrels, Air Straightener 2x, anti-snag loop brush, large round brush, fast dryer, case. Launched July 2025 at $699.99, and Airwrap i.d. was cut from $599.99 to $499.99 (Tom's Guide, Jul 15, 2025). The price rose $50 between launch and Sept 2026. Reason not verified (tariffs possible but unconfirmed).
• Dyson Unveiled 2026 (early Sept 2026, IFA timing): Corrale CoolShine straightener (price TBC) and Airsmooth hot air brush (£199.99, UK "now available"); Plum/Copper colorway (Wallpaper*, Sept 4, 2026). US price and date not confirmed.

ghd (ghdhair.com/us; ghd is owned by Wella Company)

• Flat irons: Sculpt $449 (AI heat adaptation, new); Chronos Max $379; Chronos $359; Platinum+ $319; Max $299; Gold $279; Original ~$239; Unplugged (price not shown). All run at 365°F.
• Dryers: Speed $429 (halo dual-airflow, cool-scalp); Helios $329 (1875 W, brushless); Air $239 (1600 W); Flight+ (not shown).
• Wet-to-dry: Duet Blowdry $429; Duet Style (price not shown). Bundle: Platinum+ & Helios $454 (from $648).

Others

• BaBylissPRO Nano Titanium Falco (BNT8550): $249.99; 2000 W; 4 heat/3 speed; LED display with memory; ion generator; 9 ft cord; magnetic rear filter; made in Italy; 2-year warranty.
• Shark FlexStyle 4-in-1 (HD430): $349.99; 1,600 W peak; 3.72 lb (system); 8 ft cord; 120 V; 2-year limited warranty; "1,000x per second" temperature regulation; Coanda auto-wrap barrels.
• Laifen Swift: $169.99 (Silver Blue), $139.99 (Pearl White, Mirror Black); code promo $118.99. 110,000 RPM; 22.3 m/s airflow; 1400 W, 120 V (not dual voltage); 59 dB; 407 g; hot/warm/cold with 85°C max; 100x/sec thermo-control; claimed ~1,000 h motor life; 2-year warranty. A Laifen Swift 4 was shown at CES 2026 (The Shortcut headline; not fetched).
• T3: Aire 360 $297.49 sale (reg. $349.99); AireLuxe $224.99; Featherweight StyleMax $209.99; Aire IQ $299.99 sale (reg. $399.99); Afar $199.99; Featherweight Compact $150 (sold out).
• Harry Josh Pro Dryer 2000: $280 (sold out); "just over one pound"; 2,000-hour AC motor; "80 mph" airflow claim.
• Parlux US: Digitalyon + Magic Sense diffuser $360 ("regular $720"); Alyon $305 ("reg. $610"); Advance Light $275; 385 PowerLight $270; Ethos + MagicSense $399; Elysium $450 ("reg. $900"). The persistent 50%-off pattern suggests reference prices that may not reflect real selling prices. Flagged.
• L'Oréal Professionnel AirLight Pro (infrared + airflow, developed with Zuvi): reviewed by WWD (2025) and CNN Underscored. Price not verified.

2.2 Counterfeits

• Dyson enforcement release (Jan 19, 2026 action): 22 sites in Guangdong; 22,000 finished fakes; 30,000 accessories; 250,000+ packaging; 36 production machines; 30 detained. Destinations: Germany/EU, UK, USA, Gulf. Advice: buy from Dyson or authorized retailers; check seller location and history; watch for poor quality, typos, chemical odors, unusual payment methods.
• Dyson counterfeit guidance page: fakes copy logos, packaging, serial stickers and warranty cards. Signs include misaligned logos, uneven joins, scratches, low-quality packaging and typos. Dyson doesn't service fakes but sometimes helps with refunds.
• UK OPSS notice (Dec 24, 2025), counterfeit Dyson Supersonic: plug not to BS 1363 dimensions, high electric-shock risk, non-conforming fuse could overheat; import rejected at border; barcode 5025155063705; misspelled safety warning; origin China.
• ghd counterfeit FAQ: fake electricals "may cause electrocution, serious burns and hair damage." Buy via salon locator or approved stockists; avoid social media sellers; use the website checker; guarantee void for fakes; report to fake@ghdhair.com; ghd works with police, customs and Trading Standards and has taken court action.
• A French consumer blog (ConsoInfo, Mar 20, 2026) covered counterfeit Dyson dryers (not fetched).

2.3 CPSC recalls and warnings (hair tools)

Pattern (Medium-High): Low-cost marketplace dryers and dryer brushes lacking immersion protection (the ALCI/IDCI plug required by UL 859 / the 16 CFR 1120 substantial product hazard rule for hand-held hair dryers [rule citation from background knowledge — verify]) account for many actions.

3. Salon booking and management software

All pages accessed Sept 17, 2026 unless otherwise dated.

3.1 Pricing and fees

Vagaro

• Pricing page: $23.99/mo "exclusive rate for the first 6 months" (intro framing); "Multiple Locations" $30; 30-day trial (excludes email/text marketing, branded app); cancel anytime with no fee; "Free listing on the Vagaro Marketplace" with no booking fees.
• Help article (updated Aug 28, 2026): US $23.99/mo base, plus $10 per additional calendar up to 7, unlimited after; Canada $35; UK £20; Australia $45.
• Add-ons: text marketing $20–$2,500; email free–$90; branded app $100–$280 plus dev fee; forms $10–$15; MySite $20–$30; Data Lake $40; Live Stream $10–$15; Vera Receptionist $10–$15; APIs from $10; payroll $34 + $5/employee; check-in app $10–$15; training $100–$140.
• Processing (updated Jul 1, 2026):
  • Under $4k/mo volume: card present 2.6% + $0.10; keyed 3.5% + $0.19; tap to phone 2.6% + $0.16.
  • Over $4k/mo: 2.29% + $0.19; keyed 3.5% + $0.19; tap to phone 2.29% + $0.25; plus $10/mo.
  • BNPL 6% + $0.30; ACH 1%; ACH return $2.50; FANF variable; Mastercard location fee $1.25/mo; chargebacks $7.50 / $15.
• Corporate: FTV Capital funding 2018 ($63M) and 2021 (~$1B valuation); acquired Schedulicity in 2025 (Wikipedia; secondary).

Fresha

• Independent $19.95/mo; Team $14.95 per bookable team member/mo; Enterprise custom (20+).
• Processing: online 2.79% + $0.20; in-person 2.29% + $0.20 (+$0.10 per Tap to Pay authorization); manual 3.30% + $0.20; Klarna 5.99% + $0.30.
• Marketplace: 20% one-time commission on new clients (min $6); returning clients free.
• Messaging: 100 free/mo, then $0.02/SMS, $0.04–$0.11 WhatsApp; 50 free emails, then $0.02.
• AI Concierge add-on $99.95/location/mo; Team Connect $2.95/team member/mo.
• UK (Bee Viral, ~Jul 2026): £14.95 solo, £9.95 per member; online 1.40% + 25p; in-person 1.19% + 20p; marketplace 20% (min £4).
• On cancel: workspace access removed, marketplace profile unlisted, reviews retained but hidden. On payment failure: account paused.
• Pricing history: Pabau (competitor; Apr 10, 2026, updated Aug 25, 2026) says Fresha "eliminated its free-forever plan" in 2025, with Reddit complaints. TimeTailor (competitor, undated) says "As of 2025… $9.95 monthly fee per team member in some regions." No official Fresha announcement located. Confidence Low-Medium on dates.
• 2026 roadmap blog (Dec 19, 2025; updated Jan 14, 2026): AI Receptionist, two-way messaging, Fresha Capital, forms, etc., "coming early 2026."

GlossGenius

• Standard $28/mo ($24 annual); Gold $56 ($48); Platinum $168 ($148). Medspa Practice Essentials $168 ($148); Practice Advanced $298 ($248).
• Flat 2.6% processing including Tap to Pay, card on file and manual.
• Standard and Gold for teams under 10; Platinum for 10+.
• Help articles exist for client-list export and data export; free data transfer page. Contents not reviewed.

Square Appointments

• Free $0; Plus $49/location; Premium $149/location.
• In-person 2.6%/2.5%/2.4% + 15¢; online 3.3% + 30¢ (Free) or 2.9% + 30¢; manual/card on file 3.5% + 15¢.
• 30-day trial; custom pricing over $250k/yr. The fetch tool suggested the page footer referenced Feb 2025. Treat as "as displayed Sept 17, 2026."

Boulevard

• Per location/mo: Essentials $143 (up to 5 providers; 250 texts; 1,000 email blasts; 50 GB); Premier $234* (normally $293; unlimited professionals); Prestige $328* (normally $410; Forms, 2,500 texts, 10,000 emails, 100 GB); Enterprise custom. *Annual 10% discount; "limited-time summer pricing" for new customers.
• Add-ons: Forms from $65/mo/location; ePrescribe $45/prescriber; QuickBooks $45/mo/location; email $0.01 each over allowance.
• "Boulevard Offset": client pays 3%, business 1%. Processing rates not published.

Mangomint

• $120/mo base + $10 per user (all staff with profiles). Add-ons: phone $70/line; marketing from $30; payroll $50 + $8/worker; additional locations $120 each.
• Processing: in-person 2.45% + 15¢; virtual 2.90% + 30¢.
• No contracts; cancel anytime; "You can take all of your data with you"; free onboarding and data transfer.

Booksy (US)

• $29.99/mo + $20 per extra staff; 14-day trial; month-to-month.
• Boost: one-time 30% of the first visit, free to activate.
• Processing: mobile/keyed 2.69% + $0.30; Booksy reader 2.49% + $0.10; Tap to Pay 2.49% + $0.20; next-day payouts free; fast payouts (30 min) 1.5%.
• Hardware: BBPOS WisePOS E $219.85; Stripe M2 $53.10. 2,000 SMS/mo included.

Meevo (Millennium Systems International)

• Lite, Essentials, Premier, Enterprise; quote-only.
• "subscriptions are based on an annual contract"; cancellation "30-day notice by the 11th month"; monthly plans require 30 days' notice. MeevoPay rates not published.

Zenoti: Quote-only. Zenoti OS plus an "AI Workforce" (AI Digital Marketer, Lead Manager, Receptionist, Concierge, Dispute Manager, Business Advisor, Sidekick, Retention Manager, Employee Scheduler, Inventory Manager). "You must be on our AI Plus package to leverage our AI Agents."

Phorest (US): Starter, Grow, Complete Advantage, Elite. No prices displayed. SMS: Starter 5¢/msg; Grow 4¢ + 1,000 free; Complete Advantage 5,000 free/mo; Elite 27,500 free.

SalonBiz: Not verified (search budget exhausted before fetch).

3.2 Lawsuits and controversies

• Targeted searches found no significant class actions or regulator actions over fees against these salon platforms (not exhaustive; PACER not searched). The main documented controversy is Fresha's move to paid plans plus marketplace commission (competitor-sourced).
• General context: FTC rule on unfair or deceptive fees (Fenwick FAQ appeared in results; final rule scope is limited to live-event tickets and short-term lodging [background — verify]). Not directly applicable to B2B salon software.

3.3 Client-data ownership notes

• Mangomint promises full data portability. Vagaro and GlossGenius publish export help articles (contents unverified). Fresha removes workspace access on cancellation.
• Stored card tokens are held by processors, so portability depends on the processor. [general knowledge]
• Marketplace apps show other businesses to consumers (competitor claim, TimeTailor).
• An EU blog (profitsite.eu) discusses who owns client data from platform bookings (not fetched).

4. AI and tech in salons

Verified (fetched)

• AI receptionists: Vagaro Vera Receptionist $10–$15/mo; Fresha AI Concierge $99.95/location/mo, with AI Receptionist on the early-2026 roadmap; Zenoti AI Receptionist (AI Plus package, quote).
• Sensor and "AI" hot tools: ghd Sculpt "AI heat-adaptation" ($449); Dyson Supersonic Nural auto-adapt and scalp claims; Airwrap Co-anda2x RFID attachments and app; Shark 1,000x/sec; Laifen and Dyson 100x/sec.
• Dyson says its 2026 range shifts "from purely mechanical devices to intelligent machines" with AI and machine learning (Wallpaper*, Sept 4, 2026).

Confirmed to exist via search result titles, not re-read

• L'Oréal Paris Colorsonic: PR Newswire "L'ORÉAL PARIS LAUNCHES COLORSONIC, A FIRST-OF-ITS-KIND HAIR COLOR DEVICE…" (release ID 302164813) and "…COLORSONIC, NOW EXCLUSIVELY AVAILABLE AT TARGET" (302206685). Cosmetics & Toiletries and Cosmetics Business covered the launch ("decade in the making"). Launch year 2024 [NOT RE-VERIFIED]; price not verified.
• L'Oréal Professionnel AirLight Pro: loreal.com article; WWD 2025 review; developed with Zuvi.

Background knowledge [NOT RE-VERIFIED — check before publication]

• L'Oréal acquired ModiFace (AR/AI beauty) in March 2018.
• Colorsonic and Coloright were unveiled at CES in January 2023. Coloright was described as an in-salon system that analyzes hair and dispenses personalized color. Current salon availability is unknown.
• Perfect Corp (YouCam) went public on NYSE (PERF) in 2022 via SPAC and licenses AR/AI beauty try-on, including hair color and hairstyle.
• Henkel/Schwarzkopf Professional SalonLab (Analyzer handheld NIR device, Consultant app, Customizer) launched around 2018–2019. 2026 status unknown.
• Vish and SalonScale: Bluetooth-scale color tracking and waste apps. Pricing unknown.
• Wella virtual try-on: not verified.
• Illinois BIPA litigation has targeted virtual try-on features (e.g., a 2022 case against Louis Vuitton North America). Salon websites embedding try-on should check biometric consent.
• FTC "Operation AI Comply" (Sept 2024) targeted deceptive AI claims.

Assessment

AI receptionists, try-on and formula-tracking are commercially available. In-salon AI color creation remains unconfirmed. AI damage-reduction claims on hot tools are manufacturer-tested only. No independent accuracy studies were found for try-on across hair textures (search limited).

5. Stylist occupational health

Confirmed to exist (titles and URLs seen); full text not re-read

• Kozak A, et al. "Musculoskeletal health, work-related risk factors and preventive measures in hairdressing: a scoping review." J Occup Med Toxicol, 2019 (doi:10.1186/s12995-019-0244-y). Author name from background knowledge.
• "Prevalence of work-related musculoskeletal disorders among hairdressers." IJOMEH (PubMed 26190730; ijomeh.eu article 2378), 2015.
• "The Impact of Lower Extremity Fatigue on Lower Quadrant Dysfunction and Health Profile in Hairdressers." PMC10281072 (2023).
• "Incidence and Prevalence of Work-Related Musculoskeletal Disorders and Their Risk Factors among Hairdressers and Beauticians: A Cross-Sectional Study." Journal of Chemical Health Risks (article 3145). Lower-tier journal.
• IJSHR 2022 "Prevalence of Musculoskeletal Disorders among Hair…" Lower-tier journal.
• DOAJ results for BMJ Open (Jan 2025), Systematic Reviews (Oct 2024) and RGUHS J Physiotherapy (Jan 2025) appeared in an MSD-hairdresser search. Titles and relevance not confirmed.

Background knowledge [NOT RE-VERIFIED — check before citing numbers]

• MSDs:
  • Mussi G, Gouveia N. Occup Med 2008, a Brazilian hairdresser survey, reported a high prevalence of work-related MSD symptoms (roughly 70%), mostly shoulders, low back and wrists/hands.
  • Common risk factors: shoulder elevation and abduction, neck flexion, repetitive wrist and hand movements with force (shears), prolonged standing, long hours, few breaks.
• Ergonomic shears: Evidence is limited to small lab/field studies (e.g., Boyles, Yearout & Rys, Int J Industrial Ergonomics 2003, on hairdressing scissors design). No robust RCTs.
• Dermatitis:
  • Hairdressers consistently rank among the highest-incidence occupations for occupational skin disease in European registries. For example, Northern Bavaria registry data (Dickel et al., Br J Dermatol 2002) put hairdresser incidence near 97 per 10,000 workers per year.
  • Apprentices are at high risk, driven by wet work.
  • Key allergens: PPD/PTD, ammonium persulfate, glyceryl thioglycolate, nickel.
  • Germany's TRGS 401 defines wet work as ≥2 h/day of wet hands or occlusive gloves.
  • EU projects SafeHair and SafeHair 2.0 addressed prevention.
  • European Framework Agreement on OSH in hairdressing: signed 2012 by Coiffure EU and UNI Europa Hair & Beauty, revised 2016. The European Commission hasn't proposed it as a directive.
• Respiratory and cancer:
  • Persulfate bleach is a recognized cause of occupational asthma and rhinitis.
  • Formaldehyde from smoothing treatments: OSHA 29 CFR 1910.1048 sets a PEL of 0.75 ppm (8-h TWA), an action level of 0.5 ppm and an STEL of 2 ppm. OSHA issued a 2011 hazard alert on hair smoothing products.
  • IARC Monograph 99 (2010) classifies occupational exposure as a hairdresser or barber as Group 2A (probably carcinogenic), mainly bladder cancer. Personal use of hair dyes is not classifiable (Group 3).
• Standing: NIOSH/OSHA general guidance favors anti-fatigue matting, supportive footwear, sit-stand options and job rotation. No salon-specific RCT evidence.

Not obtained

OSHA hair salon page contents (osha.gov/hair-salons fetch failed with 429); NIOSH salon pages; BLS injury and illness rates for hairdressers (SOII); EU-OSHA hairdressing e-guide.

Open questions / not verified

1. Fresha's official dates for ending the free plan and introducing the marketplace fee.
2. SalonBiz, Phorest, Meevo and Zenoti actual prices; Boulevard processing rates.
3. Fields included in Vagaro and GlossGenius client exports.
4. Colorsonic launch date and price; Coloright commercial status; ModiFace, Perfect Corp, Vish and SalonScale current offerings and prices; Wella try-on tools.
5. Numerical MSD prevalence and dermatitis incidence figures (need full-text reads of Kozak 2019, IJOMEH 2015, Mussi & Gouveia 2008, Dickel 2002).
6. Current OSHA and NIOSH salon guidance page contents; BLS SOII data for personal care workers.
7. EU hairdressing framework agreement's current status.
8. Dyson Nural launch price, and the reason for Co-anda2x's $50 price increase.
9. US pricing and timing for Dyson Corrale CoolShine and Airsmooth.
10. Shaw et al. 2025 heat damage scale details; Lima 2019 "Heat-damaged evaluation of virgin hair" findings.
11. Legend Brands/Bliss, Teckwe/SHEIN and AliExpress recall unit counts and dates.

Source list

Research Dossier 05: Salon Business, Economics, Licensing, Employment and Industry Trends

Research date: September 17, 2026 Cluster: Salon business, economics, licensing, employment and industry trends Supports posts: 22 (commission vs. booth vs. suite), 23 (pricing), 24 (licensing by state), 25 (no tax on tips), 26 (state of the industry)

Scope: US labor market data for barbers, hairdressers, hairstylists and cosmetologists; salon industry size and structure; salon suite franchises; compensation models; worker classification; tip reporting and the 2025 federal qualified-tips deduction; cosmetology and barber licensing hours, reforms, and the Cosmetology Licensure Compact; beauty school costs and federal accountability; pricing methods and retail margins; chain salons (Regis).

Method note and limitations: Research used WebSearch and WebFetch only. Partway through, the session's shared web-search budget ran out (200/200) and WebFetch was persistently rate-limited (HTTP 429). As a result, several planned items could not be verified. They are listed under "Open questions," including Ulta Beauty salon data, Great Clips unit counts, current federal gainful-employment status, IJ's beauty school debt report figures, and state hidden-fee laws. Where a figure came through a secondary summarizer, this dossier says so. Some WebFetch outputs are model summaries of pages. Where precision mattered (BLS wages), verbatim quotes were requested and used.

Key findings

1. BLS (OOH, modified Aug. 27, 2026): 670,800 jobs in 2025 (hairdressers, hairstylists and cosmetologists 595,000; barbers 75,800). Group median pay was $35,880/yr ($17.25/hr) in May 2025. Hairdressers, hairstylists and cosmetologists: median $17.21/hr (10th percentile <$13.00; 90th >$34.23). Barbers: $18.37/hr (<$13.75; >$36.76). Tips are included. Confidence: High (verbatim quotes). BLS OOH
2. Projections 2025–35: +7% combined ("much faster than average"), +48,400 jobs, 80,300 openings/yr. Split: hairdressers etc. +8% (to 640,900), barbers +3% (to 78,300). Confidence: High for the combined figure; Medium for the split (from a summarized read of the projections tab). BLS OOH
3. Self-employment: 80% of barbers and 48% of hairdressers, hairstylists and cosmetologists are self-employed (BLS). OEWS wage data largely excludes self-employed workers, so the medians describe employees. Confidence: High.
4. No tax on tips: Final regs (TD 10044; Federal Register April 13, 2026; effective June 12, 2026) list TTOC 603 "Barbers, Hairdressers, Hairstylists, or Cosmetologists" (shampooers illustrative) and TTOC 606 eyebrow/eyelash technicians. The deduction is up to $25,000 per return, for tax years 2025–2028, and phases out by $100 per $1,000 of MAGI over $150,000/$300,000. It is available to itemizers and non-itemizers, requires an SSN and joint filing if married, and for the self-employed is limited to net income from the business. Service charges are excluded. FICA/SE tax still applies. SSTB rules are reserved, with transition relief under Notice 2025-69. Confidence: High. Federal Register; IRS; RSM
5. Cosmetology Licensure Compact: 13 member states (AL, AZ, CO, DE, KS, KY, MD, OH, PA, TN, VA, WA, WV). PA was 13th (July 2026). The commission said in July 2026 that the compact was not yet operational. Secondary sources report Arizona issued the first multistate licenses in mid-September 2026 ($30 compact fee). Confidence: High on membership; Medium on issuance (not confirmed on official sites). Commission; GL Solutions
6. Licensing burden: IJ's License to Work 3 (2022) found cosmetologists licensed in all 51 jurisdictions, with 233–490 days of education/experience (≈1,000–2,100 hours; Iowa highest), fees of $60–$450, and 15 states reducing requirements since 2017. Confidence: High for IJ's data; note IJ is an advocacy organization. IJ
7. Reforms: CA SB 803 (1,000 hours; health/safety 65→100 hours); TX 1,000 hours; Utah SB 330 (1,250-hour cosmetology via school or apprenticeship, eff. Jan. 1, 2026); Iowa HF 711 (June 2025, supervised establishment-training route); Ohio HB 238 (Jan. 2025, 450-hour natural hair stylists may cut); Illinois HB 3460 (2026, apprenticeships). Confidence: Medium-High (mix of official and secondary sources).
8. Salon suites (company-reported): Sola 750+ units, 21,000+ pros (Feb. 2026); Phenix 420+ (end 2025), plans 30+ openings in 2026; MY SALON Suite 370+ locations, 165 franchisees, 10,000+ members (Mar. 2026). Sola 2025 FDD (third-party summary): 660 franchised + 69 company units at end of 2024; median 2024 location gross revenue $420,052; average December 2024 occupancy 88.5%. Confidence: Medium (self-reported / secondary).
9. Census revenue (employer firms, SAS via FRED): beauty shops $27.035B (2022), up from $24.0B (2018), with a trough of $18.2B in 2020. Barber shops $1.819B (2022) vs. $1.207B (2018), +51% nominal. Confidence: High (data only through 2022; nominal).
10. Regis Q3 FY2026 (quarter ended Mar. 31, 2026): 3,770 salons (3,497 franchised; 273 company-owned); Supercuts same-store sales +5.0%; revenue $52.4M; net income $0.7M; $127.1M borrowings with refinancing efforts. Confidence: High (company filing/release).
11. Classification: IRS Pub 4902 lists booth-renter indicators (own key, own hours, own products, own phone/business name, sets prices). California Labor Code §2778 lets licensed barbers and cosmetologists be contractors only if all conditions are met (own rates and payments, paid directly by clients, own hours and clients, own book and scheduling, own business license, 1099 to salon when renting); the manicurist provision sunsets Jan. 1, 2029. The DOL proposed an FLSA contractor rule in Feb. 2026 (comments to Apr. 28, 2026) that was not final as of Aug. 2026. Confidence: High (IRS/CA); Medium (DOL status after Aug. 2026).
12. Commission norms: A 2023 Mangomint survey (non-random, US/Canada) found staff most often report 50–59% commission (44% of staff) and owners 40–49%; 33% use sliding scales; 27% deduct product costs; 93% pay retail commission; 74% of rental arrangements are flat fees. Confidence: Medium (vendor survey).
13. Suite rent ranges: Salons by JC (a company source, July 2026) cites weekly suite rent of $265–$480 in smaller markets, $295–$650 in mid-sized cities and $325–$900 in major metros; its own suites run $230–$300. Confidence: Low-Medium (interested party; no independent dataset found).
14. 1099 thresholds: OBBBA raised the 1099-NEC/MISC threshold from $600 to $2,000 for payments after 2025; the 1099-K threshold reverted to $20,000 and 200 transactions. Confidence: Medium-High (IRS FAQ and trade press titles; full text not re-fetched due to rate limiting).

1. Labor market: BLS data

1.1 Employment and pay (Occupational Outlook Handbook, modified Aug. 27, 2026)

Verbatim quotes from the BLS page:

• "The median hourly wage for barbers was $18.37 in May 2025."
• "The median hourly wage for hairdressers, hairstylists, and cosmetologists was $17.21 in May 2025."
• Barbers: "The lowest 10 percent earned less than $13.75, and the highest 10 percent earned more than $36.76."
• Hairdressers etc.: "The lowest 10 percent earned less than $13.00, and the highest 10 percent earned more than $34.23."
• Quick Facts: "2025 Median Pay | $35,880 per year $17.25 per hour"; "Number of Jobs, 2025 | 670,800"; "Job Outlook, 2025–35 | 7% (Much faster than average)"; "Typical Entry-Level Education | Postsecondary nondegree award."
• Self-employed workers: 80% (barbers); 48% (hairdressers, hairstylists and cosmetologists). "Some lease booth space from a salon owner."
• BLS says tips are included in the wage data.
• Largest employers of hairdressers etc.: self-employed 48%, personal care services 45%, retail trade 5%.
• Median by industry (summarized read): hairdressers in personal care services ~$36,172; in retail ~$30,826; barbers in personal care services ~$37,900. Medium confidence (summarized).
• All occupations median: $50,980 ($24.51/hr).
• Annual openings: 80,300; new jobs 2025–35: 48,400.

Annual medians by occupation: hourly × 2,080 gives ≈$35,797 for hairdressers etc. (ONET lists $35,790) and ≈$38,210 for barbers. A summarizer returned "$38,129" for barbers, which is inconsistent. Use hourly figures or the group's $35,880. O*NET 39-5012.00 (ONET still shows 2024–34 projections: 575,200 employed in 2024, 5–6% growth.)

Limitations:

• OEWS surveys employers, so wage data covers employees, not most self-employed stylists.
• The 2025–35 projection series is new. Older secondary articles cite 2024–34 figures (e.g., +5%, ~84,200 openings).
• BLS OEWS HTML tables for May 2025 could not be fetched (index pages only).

1.2 Implications

• Half or more of the field works outside employer payrolls, so official wage medians understate the share of income from independent work and don't describe suite owners' earnings.
• Projected openings are dominated by replacement needs, which points to high turnover and exit.

2. Industry size and structure

2.1 Census Service Annual Survey (via FRED), employer firms

Sources: FRED REVEF812112ALLEST; FRED REVEF812111ALLEST. The series ends in 2022. Figures are nominal and exclude nonemployer businesses.

Boulevard computed average employer beauty-salon revenue of ≈$321K in 2022 ($27.035B ÷ 84,176 employer establishments). The establishment count is attributed to Census but was not independently verified. Boulevard

The Census Nonemployer Statistics API requires a key, so direct pulls failed. Current nonemployer counts for NAICS 812112 and 812111 are unverified.

2.2 Private market-size estimates (methodology flags)

• IBISWorld (as cited by Boulevard, updated June 2026): US hair salons $60.6B (2024) and $60.0B (2025); ~1,051,796 hair salon "businesses" (2024); hair and nail combined $90.4B/$90.9B. Flags: proprietary model; business counts include nonemployers (sole proprietors); secondhand citation.
• PBA Economic Snapshot (July 2020): 106,227 employer establishments (2019; $31.5B sales in 2018); 1,123,045 nonemployer establishments (2018; $30.6B); "more than 1.2 million total establishments and annual sales of more than $62 billion." 2008–2018: nonemployer establishments +36%, sales +63%; employer establishments +17%, sales +48%. Payroll jobs fell from 569,000 (Feb. 2020) to 93,000 (Apr. 2020). Flags: "salon industry" includes nail and skin businesses; data are 6+ years old; sources are Census, BLS and the 2012 Survey of Business Owners. PBA via IAHD
• Why estimates differ: Census employer revenue (~$27B beauty shops in 2022) vs. ~$60B (IBISWorld) mostly comes down to including nonemployers, plus differing scope (retail, nails, spas).

2.3 Salon suites

Interpretation: suite brands continue net growth, but Sola's openings (19 in 2025) are modest relative to its 750-unit base, and occupancy spread in FDD data shows location risk. FDD revenue is franchisee rent revenue, not stylist income. The 2026 Sola FDD (end-2025 counts) was not reviewed.

2.4 Chains: Regis

• Q3 FY2026 (quarter ended Mar. 31, 2026): 3,770 salons (3,497 franchised = 92.8%; 273 company-owned = 7.2%); Supercuts same-store sales +5.0% (vs. +1.1% a year earlier); revenue $52.4M (YTD $168.5M); net income $0.7M (YTD $2.5M); borrowings $127.1M ($116.4M term loan, $9.7M PIK interest, $1.0M revolver); cash $22.9M. Management emphasized traffic, brand standards, technology and loyalty, and "ongoing efforts to refinance existing credit arrangements." Business Wire, May 13, 2026
• Regis's earlier restructuring history (asset-light pivot, 2022–2024 debt amendments, the company-owned salon count rising after a 2024 franchisee acquisition) is not verified in this session. Do not publish specifics without a source. The Q4/FY2026 results (fiscal year ended June 30, 2026) were not retrieved.

2.5 Men's grooming / barbershops

• Census employer revenue for barbershops grew +51% nominal (2018–2022) vs. +13% for beauty shops.
• BLS projects slower job growth for barbers (+3%) than hairdressers (+8%) for 2025–35. Barbers are 80% self-employed.
• No independent 2025–26 men's grooming service market data was retrieved.

3. Compensation models

3.1 Commission

• Mangomint survey (May 2023; "hundreds of owners, managers, and staff" in the US and Canada) link:
  • Staff-reported service commission: <20%: 7%; 20–29%: 12%; 30–39%: 12%; 40–49%: 17%; 50–59%: 44%; 60–69%: 8%; ≥70%: 0%.
  • Owners/managers most commonly report 40–49%.
  • 33% use sliding-scale commission; 93% pay retail commission; 60% deduct nothing from commission, 27% deduct supplies, 13% deduct card processing; 54% track commission in software.
  • Rental arrangements: 74% flat fee, 17% percentage of sales, 9% hybrid; 58% collected monthly, 17% weekly.
  • Limitation: vendor survey, non-probability sample.

3.2 Booth rent

• No independent source with booth rent dollar ranges was verified (a GlossGenius page was rate-limited). Posts use an illustrative $250/week, clearly labeled.

3.3 Suite rent

• Salons by JC (July 21, 2026; modified Aug. 4, 2026): major metro $325–$900/week; mid-sized cities $295–$650; smaller markets $265–$480; Salons by JC $230–$300. Includes chair, mirror, shampoo bowl, utilities, Wi-Fi and a concierge manager. Two-month refundable deposit (e.g., ~$2,076 for a $259.50/week suite). Month-to-month. Limitation: competitor-framed marketing content.

3.4 Illustrative break-even model (used in Post 22)

Assumptions: 48 working weeks, 52 rent weeks; 45% commission; independents' product 10% + card fees 3% of sales; booth $250/week + $3,360/yr other fixed costs; suite $400/week + $5,460/yr; subtract the additional half of FICA (7.65% × 92.35% of net). Results (annual, before income tax):

• $800/week sales: commission $17,280 | booth $15,844 | suite $6,643
• $1,000: $21,600 | $23,606 | $14,405
• $1,500: $32,400 | $43,010 | $33,810
• $2,125: $45,900 | $67,267 | $58,066
• $2,500: $54,000 | $81,820 | $72,620
• Break-even vs. commission: ≈$890/week (booth), ≈$1,425/week (suite).

These are model outputs, not data.

4. Worker classification

4.1 IRS

• Publication 4902 (Tax Tips for the Cosmetology & Barber Industry, Feb. 2011): booth renter indicators are "having a key to the establishment," "setting your own hours," "purchasing your own products," "having your own phone number and business name," and "determining the prices to be charged." If these are absent, the worker is likely an employee. Employees report tips to the employer by the 10th of the following month; employees keep daily tip records (Form 4070A). The publication's statement that renters issue a 1099-MISC for rent over $600 predates the OBBBA threshold change. IRS P4902 Limitation: 2011 publication.
• 1099 thresholds (OBBBA): 1099-NEC/MISC $600 → $2,000 for payments after Dec. 31, 2025 (indexed later) CPA Practice Advisor, July 30, 2025; 1099-K reverts to $20,000 / 200 transactions IRS FAQ. Full text not fetched (rate limit). Titles and prior knowledge are consistent.

4.2 California AB5 / Labor Code §2778

The exemption from the ABC test for a licensed barber or cosmetologist (Borello test applies instead) requires the individual to:

1. Set their own rates, process their own payments, and be paid directly by clients.
2. Set their own hours and have sole discretion over the number of clients and which clients to serve.
3. Have their own book of business and schedule their own appointments.
4. Maintain their own business license for the services offered.
5. If performing work at the hiring entity's location, issue a Form 1099 to the salon or business owner from which they rent space.

The provision becomes inoperative for licensed manicurists on Jan. 1, 2029, with a report on misclassification allegations due to the Legislature by June 1, 2026. Labor Code §2778. Confidence: High on the statute text; verify the exact subsection lettering before quoting it.

4.3 US Department of Labor (FLSA)

• A proposed rule (announced Feb. 26–27, 2026) would rescind the 2024 rule and restore a 2021-style test with two core factors: control and opportunity for profit/loss. The comment period closed Apr. 28, 2026. Per Jackson Lewis (Mar. 4, 2026), the 2024 rule remains in effect for private litigation, while DOL field staff analyze status using a 2008 fact-sheet framework. Jackson Lewis
• Status: "not yet finalized" as of Aug. 19, 2026. SelfEmployed.com Not verified after Aug. 19, 2026.

5. Tips: reporting and the qualified tips deduction

5.1 Legal basis and timeline

• OBBBA (2025) created IRC §224.
• Treasury published a preliminary occupation list in 2025 and proposed regulations later that year. Final regulations, TD 10044, were announced Apr. 10, 2026 (IR-2026-49), published in the Federal Register Apr. 13, 2026, and became effective June 12, 2026.
• The final list added visual artists, floral designers and gas pump attendants relative to the proposal.
• Hair occupations: TTOC 603 Barbers, Hairdressers, Hairstylists, or Cosmetologists, with "Shampooers" as an illustrative example; TTOC 606 Eyebrow and Eyelash Technicians. These fall in the 600s "personal appearance and wellness" category.

5.2 Deduction mechanics

• Cap: $25,000 per return (the cap applies per return regardless of filing status, per RSM).
• Years: 2025–2028. "No deduction is allowed under section 224 for any taxable year beginning after December 31, 2028."
• Phase-out: reduced by $100 for each $1,000 of MAGI over $150,000 ($300,000 joint).
• Available to non-itemizers; claimed on Schedule 1-A.
• Married taxpayers must file jointly. An SSN is required (issued before the return due date). Both spouses' SSNs are needed only when both have qualified tips.
• Self-employed: limited to gross income minus deductions allocable to the trade or business (i.e., net income).
• Payroll/SE taxes still apply.

5.3 Qualified tip definition

• Paid voluntarily without consequence, not negotiated, determined by the payor. Cash or cash equivalents (card, check, apps).
• Tip pools qualify, but amounts a manager or supervisor receives through a tip-sharing arrangement are not qualified tips.
• Automatic gratuities and service charges are not qualified tips.
• Must be reported on a W-2, 1099-NEC, 1099-MISC or 1099-K, or on Form 4137.

5.4 Reporting changes

• 2025: transition relief; no separate reporting required on statements.
• 2026 onward: Form W-2 Box 12 code "TP" (qualified tips) and Box 14b (TTOC).
• Specified service trade or business (SSTB): §1.224-1(g) is reserved. Notice 2025-69 transition relief treats listed tipped workers as non-SSTB "until January 1 of the first calendar year following the issuance of finalized SSTB regulations." Separate proposed SSTB regulations are expected. As of Sept. 17, 2026, final SSTB regulations could not be confirmed.
• Ohio Society of CPAs (Mar. 20, 2026) headline: "IRS change to tip deduction guidance may require amended returns." Page returned 404, so details are unverified.

5.5 Standard tip reporting (pre-existing rules)

• Employees who receive $20 or more in tips in a month report them to the employer by the 10th of the following month (Form 4070 or equivalent). Employers withhold income tax and FICA. Unreported tips go on Form 4137. IRS Pub 531; Tip recordkeeping and reporting; Topic 761. Pub 531 not re-fetched; the $20 rule is long-standing.

6. Licensing

6.1 National picture: Institute for Justice, License to Work 3 (2022)

• Cosmetologist: licensed in 51 jurisdictions; ranked 24th of 102 occupations for average burden and 5th combined. Education/experience ranges from 233 days (five states) to 490 days (Iowa). Fees range from $60 (OK) to $450 (AK). All 51 require exams; 39 set a minimum age; 35 set a minimum grade. Since 2017, 15 states reduced education requirements, and fees changed most often (usually up). IJ profile
• Reform spotlight: the 1,000-hour minimum is ≈233 days; programs often take 18+ months; average cost ~$16,000. All six barbering and beauty occupations carry higher average burdens than entry-level EMTs. Since 2017: 8 beauty licenses eliminated (e.g., makeup artists, shampooers); 60 reductions in education/experience across beauty (32% of all reductions); 32 states exempt African-style hair braiders. Examples: Alaska manicurist hours cut from 250 back to 12; Mississippi braider registration yielded 6,700+ braiders vs. 18 licensed under Louisiana's 500-hour requirement. IJ
• An AIR study cited by IJ (11 states) found an average of 1,645 required hours, ~167 (≈10%) on safety and sanitation. Cosmetologists average "about a year" of training vs. "just over a month" for EMTs. IJ FAQ
• Limitation: IJ is a libertarian public-interest law firm that litigates against licensing; its data are well-documented but framed for reform. The data are from 2022.

6.2 State examples (verified)

• Texas (TDLR): 1,000-hour Cosmetology Operator course at a licensed school; written exam available after 900 hours; practical exam after; $50 fee; age 17+; 2-year license. TDLR High.
• California (SB 803): barbers and cosmetologists 1,000 hours (from 1,500–1,600); health and safety 65→100 hours; dermaplaning added to scope. DCA blog cites an effective date of Jan. 1, 2022. CA DCA Medium-High (implementation timing may have differed from enactment; verify with BBC).
• Utah (SB 330, eff. Jan. 1, 2026): apprenticeship hours equal school hours (cosmetology 1,250; master barber 1,000; nail technology 300); licenses consolidated into a single "cosmetology license" with self-identification as barber; hair design renamed "master hair design / master barbering"; apprentices supervised, max 2 per supervisor, finish within 2 years; threading exempt. AHP, May 2, 2025 Medium-High.
• Iowa: cosmetology was 2,100 hours (IJ 2022), then 1,550 school hours after a 2023 change (per The Gazette; LJIC school page also states 1,550). HF 711 (signed early June 2025) creates a registered establishment training program: unlicensed trainees work under licensed supervision after ~2 hours of sanitation education, may seek licensure after 2,000 supervised hours, and businesses must register and disclose. Reason cites average board-approved program tuition of $19,508. Board rulemaking is required; the implementation date is unverified. Gazette; Reason; IJ Medium (summaries of barber vs. cosmetology hours were partly inconsistent).
• Ohio (HB 238, signed Jan. 8, 2025): 450-hour natural hair stylists may cut hair; boutique services expanded to include shampooing and rinsing; affidavit requirements for braiders, threaders and makeup artists removed; contact-information registration only. IJ Medium-High.
• Illinois (HB 3460): apprenticeship pathway for barbers, cosmetologists, estheticians, braiders and nail techs. WSIU (June 8, 2026) reported the bill awaiting the governor's signature; the IJ press release reports it signed (IJ page dated July 2026 per fetch). Barber education is 1,500 hours. IJ Medium (effective date unverified).
• Nebraska: 8 hours of CE every 2 years; apprentice salon application exists; initial hours not stated on the DHHS page (aggregators disagree: 1,800 vs. 2,100). NE DHHS

Warning on aggregators: A 50-state hours table (getlicensemap.com, Feb. 2026) listed Alaska, Connecticut, Georgia and Michigan at "1 hour" and Utah at 1,600, which conflicts with the official changes above. Do not use 50-state aggregator tables without board verification.

6.3 Cosmetology Licensure Compact

• Model legislation was developed with the Council of State Governments' National Center for Interstate Compacts, with DoD support and the Future of the Beauty Industry Coalition. Activation begins after the 7th state enacts, typically followed by an 18–24 month setup.
• Members (13): Alabama, Arizona, Colorado, Delaware, Kansas, Kentucky, Maryland, Ohio, Pennsylvania, Tennessee, Virginia, Washington, West Virginia. Recent enactments: West Virginia 11th (Apr. 2, 2026; HB 5087); Delaware 12th (June 15, 2026; SB 217); Pennsylvania 13th (July 20–21, 2026; SB 331). Commission news
• July 2026 status from the commission: "licensed cosmetologists in member states cannot yet practice through the compact."
• Salon Today (Mar. 12, 2026): the licensing database was under development, with state testing expected in March and multistate licenses possibly by summer 2026. An esthetics compact has legislation introduced in AL, KS and VA and drafts in CA, KY, OH and TN. Salon Today
• Sept. 2026: GL Solutions (Sept. 16) says Arizona became the first state to issue multistate cosmetology licenses, operational Sept. 10, 2026. Eligibility: active Arizona license in good standing, Arizona primary residence, $30 compact fee plus standard fees. Hoodline (Sept. 12, citing KJZZ) reports two licenses completed and ~20 applications under review, applications only during the renewal window, and cosmetologists only. Not confirmed on the Arizona BCB site or the commission news page as of fetch. Medium confidence.

6.4 Barber vs. cosmetology

• Scope differences (straight-razor shaving usually barber-only; broader chemical and color services under cosmetology) vary by state. Some states are consolidating (Utah). Hours are often similar (CA 1,000 for both). Barbers are far more likely to be self-employed (80% vs. 48%).

7. Beauty school cost, outcomes and federal accountability

• IJ: average cosmetology program cost ~$16,000 (2022 spotlight). Reason (2025) cites Iowa average tuition of $19,508.
• IJ's Beauty School Debt and Drop-Outs (2021) exists (national and Utah editions, indexed in ERIC as ED623452/ED623454). Figures not retrieved (rate limit).
• Federal Financial Value Transparency / Gainful Employment (2023 rule) and OBBBA accountability: A Federal Register document titled "Accountability in Higher Education and Access Through Demand-Driven Workforce Pell: Student Tuition and Transparency System (STATS) and Earnings Accountability" was published Apr. 20, 2026. New America published "What the One Big Beautiful Bill Means for Cosmetology Students," and NASFAA maintains a "2026 STATS/Earnings Accountability Framework" page. Whether this is proposed or final, how it treats undergraduate certificate programs like cosmetology, and what happened to the 2023 GE debt-to-earnings test could NOT be verified. This is a high-priority follow-up before publishing any claims about federal beauty school accountability.

8. Pricing, retail margins, no-shows

• Cost-per-service method (Post 23): price floor = (product + hours × (overhead/billable hour + pay/billable hour)) ÷ (1 − card % − profit %). Illustrative inputs: $30,000 fixed costs; 48 weeks × 35 hours × 80% = 1,344 billable hours → overhead $22.32/hr. $60,000 target grossed up for SE tax (≈14.13%) → $69,873 → $51.99/hr. Total $74.31/hr. Resulting floors: cut (1 hr, $3 product) ≈ $89; single-process color (2 hr, $22) ≈ $196; 1.5 hr ≈ $153; blowout (0.75 hr) ≈ $66. Model outputs, not market data.
• Keystone: retail = 2× wholesale → 50% gross margin, reduced by retail commission (93% of salons pay one, per Mangomint 2023).
• Time-based, service-based and level-based pricing: described conceptually. No independent data on prevalence was retrieved.
• No-show/deposit policies: no authoritative data on no-show rates retrieved. State hidden-fee and deposit laws (e.g., California's SB 478 "honest pricing" law) were not verified in this session; posts only advise checking local rules.
• Boulevard (vendor) reports that ~78% of online first-time bookers return vs. ~39% of walk-ins, and that ~46–50% of bookings occur after hours. Vendor platform data; not used in posts.

Open questions / not verified

1. Current federal gainful-employment / earnings-accountability status for cosmetology certificate programs (the Apr. 20, 2026 Federal Register document's status and content).
2. Whether final SSTB regulations under §224 have been issued (none found as of Sept. 2026), and state conformity with the tips deduction.
3. The Ohio Society of CPAs report of IRS guidance changes requiring amended 2025 returns (page 404).
4. Official confirmation of Arizona's multistate license issuance; other states' timelines.
5. DOL independent contractor final rule status after Aug. 19, 2026.
6. Ulta Beauty salon count and services revenue; Great Clips unit count; Regis FY2026 year-end results and restructuring history details.
7. Independent booth-rent and suite-rent datasets. Only vendor and company ranges were found.
8. Census nonemployer counts for NAICS 812112/812111 (API key required) and SAS data after 2022.
9. IJ Beauty School Debt and Drop-Outs figures; NACCAS completion and placement data.
10. Official 50-state cosmetology hour table from boards (e.g., via NIC); Nebraska, Oregon and South Dakota current hours.
11. Illinois HB 3460 signing date and effective date; Iowa HF 711 implementation rules.
12. The 2026 Sola FDD (end-of-2025 unit counts, Item 19).
13. Men's grooming services market data (independent).

Source list