Rosemary oil for hair growth: a closer look at the evidence

Rosemary oil is everywhere on social media, often described as a natural alternative to hair loss medicine. A 2024 review noted that rosemary oil has recently gained mass popularity as a promising natural option for pattern hair loss ¹. But how much of the hype is backed by research? This guide looks at the evidence and explains how to use rosemary oil sensibly if you want to try it.

The study everyone talks about

Most claims about rosemary oil trace back to one trial published in 2015 ².

• Who: 100 people with androgenetic alopecia (pattern hair loss).
• What: 50 used rosemary oil and 50 used minoxidil 2%, for 6 months.
• How it was measured: standardised close-up photos of the scalp, at the start, at 3 months and at 6 months.

What it found

• At 3 months, neither group had a significant change in hair count.
• At 6 months, both groups had a significant increase in hair count compared with the start.
• There was no significant difference in hair count between the rosemary and minoxidil groups at either time point.
• Scalp itching increased in both groups, but was more common with minoxidil.

The authors concluded that the trial provided evidence for rosemary oil in treating pattern hair loss ².

Why the evidence is still limited

This single trial is encouraging, but it has important limits:

• There was no placebo group. Without a group using a plain oil or no treatment, we cannot be sure how much of the change was due to rosemary itself.
• It is one study. Results need to be repeated by other research teams before they can be relied on.
• It lasted only 6 months. We do not know what happens over years.
• It compared rosemary with one strength of minoxidil. It does not tell us how rosemary compares with other treatments.

Two recent reviews reach a similar conclusion. A 2024 review notes that finasteride and minoxidil remain the only FDA-approved medicines for pattern hair loss, and that more research is needed on herbal remedies, including rosemary ¹. A 2025 review of herbal remedies for hair loss found that many studies had small sample sizes, short treatment periods and no long-term follow-up, and called for larger, well-designed trials ³.

What this means for you

• Rosemary oil is not a proven replacement for medical treatment.
• It may be worth trying for mild thinning if you understand the evidence is limited.
• Results, if any, are likely to take at least 6 months. In the trial, no change was seen at 3 months ².
• If you have pattern hair loss and want the best-studied options, talk to a doctor. See genetic hair loss.

How to use rosemary oil carefully

The 2015 trial did not publish a simple home recipe, so there is no proven method. These general safety steps apply to most essential oils:

• Dilute it. Rosemary essential oil is strong. Mix a few drops into a carrier oil such as coconut oil rather than applying it neat. See hair oils.
• Patch test first. Apply a small amount to a patch of skin, such as behind the ear or the inner arm, and wait a day. Stop if you get redness, itching or a rash.
• Apply to the scalp gently, using your fingertips. See scalp massage.
• Wash it out. If your scalp tends to be oily or flaky, do not leave oil on for long.
• Be consistent and patient. Judge results over months, not weeks.
• Keep it away from your eyes, and out of reach of children.

Rosemary shampoos and sprays

Many shampoos, sprays and serums now contain rosemary. These products have not been tested in the way the 2015 trial tested rosemary oil, and the amount of rosemary in them varies. Choose a shampoo mainly for your scalp's needs. See hair loss shampoo.

Who should be careful

• People with sensitive skin, eczema or a history of reactions to fragrances or essential oils
• Anyone with a sore, broken or inflamed scalp
• Pregnant or breastfeeding women, who should check with a doctor or pharmacist before using essential oils

Using rosemary with other treatments

If you are using a hair loss treatment such as minoxidil, do not stop it to switch to rosemary without talking to your doctor. If you want to use both, ask your doctor or pharmacist how to fit them into your routine, since both can irritate the scalp.

When to see a doctor

See a doctor if your hair loss is getting worse, you notice bald patches, or you are shedding heavily. Hair loss has many causes, and some need specific treatment. See sudden severe hair fall.

The bottom line

One trial found that rosemary oil and minoxidil 2% gave similar increases in hair count after 6 months in people with pattern hair loss, with less itching from rosemary. That is promising, but it is a single study without a placebo group, and reviews say more research is needed. If you try rosemary oil, dilute it, patch test it, and be patient. For ongoing hair loss, see a doctor.

Frequently asked questions

Does rosemary oil really work for hair loss?

One trial found rosemary oil and minoxidil 2% gave similar hair count increases at 6 months ². But reviews say more research is needed ¹.

How long does rosemary oil take to work?

In the trial, no change was seen at 3 months. Hair counts rose at 6 months ².

Is rosemary oil better than minoxidil?

The trial found no significant difference in hair count, though itching was more common with minoxidil ². Minoxidil is one of only two FDA-approved medicines for pattern hair loss ¹.

Can I put rosemary oil directly on my scalp?

It is safer to dilute essential oils in a carrier oil and patch test first. Studies on herbal remedies are still small and short ³.

Educational content. Not medical advice.