You’ve seen it all over TikTok. Usually that means the evidence is thin. This time it isn’t.
Does rosemary oil actually grow hair?
There’s one real trial, and it found something worth knowing.
A 2015 study put rosemary oil head to head with minoxidil 2%, the standard over-the-counter treatment [1]. After six months, both groups had significantly more hair. And there was no meaningful difference between them.
The rosemary group also had less scalp itching.
So it didn’t beat minoxidil. It matched it, with fewer complaints.
Summary
In a 2015 trial of 100 people, rosemary oil increased hair count over six months about as much as minoxidil 2%, with less scalp irritation.
What the study found
| Rosemary oil | Minoxidil 2% | |
|---|---|---|
| People | 50 | 50 |
| Hair count at 3 months | No change | No change |
| Hair count at 6 months | Significant increase | Significant increase |
| Difference between them | None | None |
| Scalp itching | Less | More |
Researchers counted hair from standardised photos at the start, at three months, and at six [1].
So should you just use rosemary oil?
Hold on. Three things about that study matter.
It used minoxidil 2%, not 5%. The 5% version works better, and it’s what most people use now. So this tells you rosemary is comparable to the weaker option.
It was 100 people, once. Nobody’s repeated it at scale. One good study means pay attention, not be certain.
It tested one kind of hair loss. Everyone in it had genetic pattern hair loss. If yours is postpartum, stress-related, or from low iron, this study tells you nothing. Our guide on hair growth supplements covers those.
Summary
The trial used the weaker 2% minoxidil, included only 100 people, and tested only genetic pattern hair loss. It’s promising rather than settled.
How do you actually use it?
Most people get this wrong, so pay attention here.
In the study, the oil went on the scalp. Every day. For six months [1].
Because here’s the thing: nothing happened at three months. Not in the rosemary group, and not in the minoxidil group either.
Judging a hair treatment at six weeks is like digging up a seed to see whether it’s growing. Your follicles work on a cycle measured in months, and no amount of checking speeds it up.
Judging a hair treatment at six weeks is like digging up a seed to check whether it’s growing.
One more thing. Rosemary oil is an essential oil, so dilute it in a carrier oil first. Undiluted, it can irritate your skin.
Summary
Apply it to the scalp, diluted, every day. Nothing showed up before six months in either group, so anything shorter tells you nothing.
Why might it work?
Blood flow, probably.
Rosemary seems to improve circulation in the small vessels of your scalp, which would mean more blood reaching the follicle. There’s also work suggesting anti-inflammatory and antioxidant effects [2].
None of it’s settled. The trial measured results, not mechanism.
Is it right for you?
Worth a try if you’ve got mild pattern thinning, minoxidil irritates your scalp, or you want to try something before going to prescriptions.
See a doctor instead if your hair loss is sudden, patchy, or severe. Pattern loss, telogen effluvium and scalp conditions all look similar from above. They’re treated completely differently.
Bottom line
Rosemary oil is one of the few natural hair treatments with a real trial behind it. It matched minoxidil 2% over six months, with less itching.
But it’s still one study, at the weaker minoxidil strength, and it needed daily scalp application for half a year. Worth trying. Not a settled fact.
Questions people ask
Does rosemary oil really regrow hair?
In one trial of 100 people with pattern hair loss, it increased hair count over six months about as much as minoxidil 2% did.
How long does it take?
Six months. Nothing had changed at three months in either group. Anything shorter tells you nothing.
Is it better than minoxidil?
No. It matched minoxidil 2% with less itching. It hasn’t been tested against 5% or the oral version, which both work better.
How do you use it?
Diluted in a carrier oil, on your scalp rather than your lengths, every day. That’s what the trial did.
Does it work for postpartum shedding?
No evidence either way. The study only included genetic pattern hair loss.
References
- 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. https://pubmed.ncbi.nlm.nih.gov/25842469/
- Murata K, Noguchi K, Kondo M, et al. “Promotion of hair growth by Rosmarinus officinalis leaf extract.” Phytotherapy Research. 2013;27(2):212-217. https://pubmed.ncbi.nlm.nih.gov/22517595/
This article is for information only and is not medical advice. Supplements are not meant to diagnose, treat, cure, or prevent any illness. Talk to your doctor before starting anything new, especially if you are pregnant, breastfeeding, or taking medication.
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