Does Rosemary Oil Really Grow Hair? What the Studies Actually Say

Rosemary oil went viral as a "natural minoxidil." Videos often claim that a study showed it works as well as the leading hair-loss treatment. That study exists, but the full picture is smaller and messier than the videos suggest.

Quick answer

  • The famous claim comes from one 2015 trial of 100 people with pattern hair loss that compared rosemary oil with 2% minoxidil for six months (PubMed).
  • Both groups had more hair at six months and neither improved at three months. The study had no placebo group, so it can't prove either treatment beat doing nothing.
  • Newer studies are small, short, often test blends, and sometimes involve branded products.
  • Rosemary oil may be worth trying if your scalp tolerates it, but it isn't a proven substitute for FDA-approved treatments. Hair loss has many causes, so see a dermatologist for a diagnosis.

The 2015 study everyone quotes

Citation: 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 abstract).

What they did

  • Who: People with androgenetic alopecia (hereditary pattern hair loss).
  • How many: 100, randomly split into 50 using rosemary oil and 50 using 2% minoxidil.
  • How long: 6 months, with check-ups at 3 and 6 months.
  • How they measured: Standardized close-up photographs to count hairs.

What they found

  • At 3 months, neither group had a significant change in hair count.
  • At 6 months, both groups had significantly more hair than at the start.
  • There was no significant difference between the two groups at either point.
  • Scalp itching increased in both groups and was more common with minoxidil.
  • Dry hair, greasy hair and dandruff didn't change significantly.

Why "as good as minoxidil" goes too far

  1. No placebo group. Without a group using an inactive oil, we can't tell how much of the improvement came from the treatments, from normal hair-cycle changes, or simply from people taking better care of their scalps during a study.
  2. "No significant difference" isn't the same as "equally effective." A study of 100 people may be too small to detect a real difference. The abstract doesn't report a formal test showing rosemary was "non-inferior."
  3. The comparison was the weaker strength. Minoxidil comes as 2% and 5% topical products. The trial used 2%.
  4. Missing details. The abstract doesn't describe the rosemary preparation or concentration, the mix of men and women, or how big the hair gains were.
  5. One study, never replicated at scale. Eleven years later, no large independent trial has confirmed it.

Confidence: High that the evidence is limited; low for any specific size of benefit.

What newer research adds

A 2025 trial of rosemary blends

A study published in Cureus in June 2025 tested a branded product line ("Rosmagain") in 90 people for 90 days, with three groups: rosemary with lavender oil, rosemary with castor oil, and coconut oil as the comparison. The authors reported faster hair growth and improvements in thickness, density and hair fall in both rosemary groups compared with coconut oil (Cureus; Tressless summary).

Limitations to keep in mind:

  • It tested branded blends, so rosemary's own effect can't be separated out.
  • 90 days is short for hair research. Hair-loss treatments typically need months to show results.
  • We could not confirm who funded the study. A trademarked product and a company-hosted PDF suggest commercial involvement.
  • Cureus is a fast-publishing, open-access journal. Its peer review is lighter than that of the major dermatology journals.
  • The authors themselves call for longer trials.

Reviews in 2024 and 2026

  • A 2024 review in Clinical, Cosmetic and Investigational Dermatology called rosemary oil a promising botanical option. It noted that finasteride and minoxidil remain the only FDA-approved drugs for pattern hair loss and that natural remedies need more validation (PMC).
  • A February 2026 review in Dermatology Reports described rosemary leaf extract as a possible natural alternative, citing lab and animal work on hair follicles. It also stressed the need for more research on how it works and its long-term benefits (Dermatology Reports).

These are narrative reviews. They summarize existing studies rather than pooling data under strict rules, so they don't add new proof.

How rosemary compares with approved options

The American Academy of Dermatology notes that topical minoxidil is FDA-approved for hereditary hair loss in men and women and usually takes months to judge. Some dermatologists also prescribe oral minoxidil (off-label), finasteride (mainly for men) or spironolactone (for some women) (AAD). These options have far more research behind them than rosemary oil, along with their own side effects. That's why the decision belongs in a conversation with a dermatologist.

Hair shedding can also come from thyroid problems, iron deficiency, stress, childbirth, illness, medications, tight hairstyles (traction alopecia) or scarring conditions. Several of these need medical treatment, and rosemary won't fix them. Scarring hair loss that isn't treated promptly can become permanent.

If you want to try rosemary oil: safety checklist

This isn't a treatment plan, just a guide to lowering risk.

  1. Get a diagnosis first if hair loss is sudden, patchy, painful, itchy, or comes with scalp redness or scaling.
  2. Never apply undiluted essential oil. Concentrated essential oils can cause irritant or allergic reactions. Use a commercial product made for the scalp, or follow the product's dilution directions.
  3. Patch test. Apply a small amount behind your ear or on your inner arm and wait 48 hours.
  4. Stop if you get burning, rash, swelling or increased itching, and tell your doctor.
  5. Keep it out of your eyes and away from children and pets.
  6. Be patient but realistic. If you see no change after several months, or loss continues, see a dermatologist rather than switching to another oil.
  7. Pregnant, breastfeeding, or managing a medical condition? Ask a healthcare professional before using essential oils.
  8. Textured and protective styles: heavy oiling under braids, locs or wigs can trap residue. Keep the scalp clean, and avoid tension at the hairline, which can cause traction alopecia no matter what oil you use.

For stylists

Clients often ask about rosemary oil. A good response: "There's early evidence, including one small study, but it's not proven. If you're losing hair, a dermatologist can find out why." Don't promise regrowth, and refer anyone with visible scalp inflammation, patches or scarring.

What we don't know yet

  • Whether rosemary oil beats a placebo in a large, independent, long-term trial.
  • The best preparation, concentration and how often to use it.
  • How it works in women, different hair textures and other types of hair loss.
  • Long-term safety with daily scalp use.

FAQ

Is rosemary oil as good as minoxidil? One 2015 study of 100 people found no significant difference from 2% minoxidil after six months. It had no placebo group and has not been confirmed by larger studies, so that claim isn't established.

How long does rosemary oil take to work? In the 2015 study, neither group improved at 3 months, and gains appeared at 6 months. Any hair treatment generally needs months to evaluate.

Can rosemary oil cause hair loss or irritation? Essential oils can irritate skin or cause allergic reactions, especially if undiluted. Strong reactions can inflame the scalp. Stop using it and see a doctor if that happens.

Does rosemary oil work for alopecia areata or traction alopecia? The main studies involved pattern hair loss (androgenetic alopecia). There's no good evidence for other types, which need medical evaluation.

Can I use rosemary oil with minoxidil? Ask your dermatologist. Combining products on the scalp can raise the chance of irritation.

This article is for general information and is not medical advice. Hair loss can signal underlying health problems. Talk to a board-certified dermatologist or your doctor.

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