Rosemary Oil vs Minoxidil: What the One Trial Actually Shows

Is rosemary oil as good as minoxidil?

One small trial found no significant difference between rosemary oil and 2% minoxidil after six months. That is the whole case for “as good as.” It enrolled 100 men, had no placebo group, and used the weaker minoxidil strength. It did not test 5% minoxidil or women, and we found nothing showing it included people with textured hair. Topical minoxidil is the FDA-approved drug. Rosemary oil is not.

Pages that say rosemary oil is “as effective as minoxidil” are quoting that one result and dropping the rest. Below is what the trial tested, why the strength matters, whether any of it applies to Black and textured hair, whether you can use both, and when it is time for a dermatologist. Nothing here says rosemary oil treats hair loss. We sell rosemary products, and we would rather you know that going in.

What did the rosemary vs minoxidil study actually test?

The study is Panahi and colleagues, published in SKINmed in 2015. It randomly assigned 100 people with androgenetic alopecia (pattern hair loss) to rosemary oil or 2% minoxidil, 50 in each group, for six months. Hair counts came from standardized microphotographs at the start, at three months and at six. The timeline (no significant change at three months, a significant rise in both groups at six, no difference between them) is in how long rosemary oil takes to work, so we won’t repeat it. Here is what that post doesn’t spell out.

  • It was men. The abstract doesn’t give the participants’ sex. Two later reviews, Bin Rubaian 2024 and Gupta 2025, describe 100 men aged 18 to 49, and Gupta calls the trial investigator-blinded. We could not open the full paper, which is paywalled, so we are relying on them.
  • It compared against 2% minoxidil. Not the 5% most people picture. More on that in the next section.
  • There was no placebo group. Both arms got an active treatment. The design can tell you rosemary did not do detectably worse than 2% minoxidil. It can’t tell you rosemary beat doing nothing.
  • The change was small. A 2026 network meta-analysis (Gupta and colleagues, in Medicina) lists the average change in hair count in this trial as +6.8 hairs/cm² for rosemary (standard deviation 31.7) and +2.3 for 2% minoxidil (standard deviation 24.2). Those are averages across people whose individual results varied several times more than the average moved. Statistically significant is not the same as large. The two groups also started from different baselines, 122.8 and 138.4 hairs on average, and Gupta’s review notes the size and location of the counted area was not reported.
  • It was a specific preparation. The rosemary was a lotion standardized to 3.7 mg of 1,8-cineol per mL, applied 1 mL twice daily, per Gupta’s review. Nothing tells you your bottle matches that.
  • Itching went up in both groups. Scalp itching rose significantly from baseline at three and six months in both arms, and was more frequent with minoxidil. Dry hair, greasy hair and dandruff did not change. So itching was less frequent with rosemary than with 2% minoxidil in this one trial. That does not make rosemary gentle.

We also could not find who funded the trial or how many people dropped out. Both would be in the full text.

What do the reviews say about rosemary oil?

They are more cautious than the headlines. Gupta and colleagues reviewed 13 investigator-blinded controlled trials of non-prescription products for pattern hair loss in Skin Appendage Disorders in 2025. Rosemary oil was one trial, Panahi. The authors wrote that none of the products were shown to be more effective than topical minoxidil or oral finasteride, that the volume of studies is lacking, and that “clinicians should exercise caution when recommending alternative treatments.”

A 2025 systematic review by Allam and colleagues looked at 16 randomized trials of herbal remedies for hair loss. It named rosemary among the herbs with promising results. It also found none of the 16 trials at low risk of bias: 43.8% had some concerns and 56.3% were high risk. That figure covers all 16 trials, not rosemary’s alone. The authors called for larger, standardized, longer trials.

Other reviews are warmer. One 2026 review calls rosemary “a more natural alternative with fewer adverse effects.” We could only read its abstract, so we can’t say what it rests on. In the one head-to-head trial we found, itching rose in both groups. We found no head-to-head rosemary vs minoxidil trial after Panahi in our PubMed searches, though we did not search ClinicalTrials.gov. A 2025 trial of rosemary blends (Patel and colleagues) ran 90 days in healthy adults, not people with pattern hair loss, and was funded by the manufacturer, with one author employed by it. It is not a minoxidil comparison either.

Does it matter that the trial used 2% minoxidil, not 5%?

Yes. Matching the weaker strength is a lower bar than it sounds. In the main 48-week trial in men (Olsen and colleagues, 393 men), 5% minoxidil beat both 2% minoxidil and placebo, with 45% more hair regrowth than 2% at week 48. It also caused more itching and local irritation. In women (Lucky and colleagues, 381 women, 48 weeks), 5% beat placebo on all three primary measures. The 2% solution beat placebo on hair count and the investigator’s rating, but not on the women’s own rating of their hair growth.

No trial compares rosemary with 5% minoxidil directly. The closest thing is indirect. A 2025 network meta-analysis in men (Gupta and colleagues) estimated 5% minoxidil ahead of topical rosemary by about 19.5 hairs/cm² (95% confidence interval 6.5 to 32.7), and ahead of 2% minoxidil by about 20.5. It put rosemary ahead of control by about 10.6 hairs/cm², with an interval of 0.8 to 20.9. Treat those as rough. The comparison is statistical rather than head to head, it covers men only, and the rosemary side is that single trial.

Do these studies apply to Black women, locs, braids and edges?

Mostly, no, and that goes for both products.

The rosemary trial was men. The minoxidil label data come from “mostly white” participants, in so many words: the women’s label describes its studies as “mostly white women aged 18–45,” and the men’s label says “mostly white men aged 18–49.” A 2019 systematic review of minoxidil for hair loss notes that efficacy varies by ethnic group, without detail in the abstract. We found no trial of OTC minoxidil built around Black or textured-hair adults.

The nearest evidence is observational. A 2025 chart review from Johns Hopkins (Wyche and Aguh, 66 Black women, single institution) looked at women who had used OTC minoxidil and then moved to a compounded prescription minoxidil that also contained a steroid and a retinoid. Of those, 21.2% reported side effects from the OTC product, scalp irritation the most common, and 44.7% stuck with it, against 84.7% adherence on the compounded one. It is one clinic, a selected group, and not a comparison of rosemary with anything. It does say that tolerating the product you’re given is part of the story.

For natural ingredients, the gap is wider. A 2020 systematic review (Ezekwe and colleagues) found no clinical trials of natural ingredients or aromatherapy for central centrifugal cicatricial alopecia (CCCA). A 2023 review of hair oils used in the Black community (Dinkins and colleagues) says more research is needed because most studies used mice.

The bigger issue is which kind of loss you have. Pattern loss, traction alopecia and CCCA are different problems with different treatments:

  • Traction alopecia is treated by reducing tension on the hair (Dakkak and colleagues, American Family Physician, 2024). Minoxidil for it is off-label, and a 2019 systematic review found it used with varying success, case by case.
  • CCCA is the most common scarring hair loss among African American women, per Herskovitz and Miteva (2016). It is diagnosed by biopsy and the loss is irreversible. They say minoxidil, along with steroids and calcineurin inhibitors, can be helpful in halting progression. A small study found no significant difference with minoxidil (Eginli and colleagues, 15 patients with CCCA), and a 2024 scoping review calls the results mixed. A 2024 expert-panel study says there is no established standard of care for CCCA.

Neither is a rosemary-or-minoxidil question until someone has looked at your scalp. We went through telling them apart in traction alopecia or CCCA: how to tell and which edge loss recovers in will my edges grow back. One label detail matters here too: the men’s 5% solution says it is not intended for frontal baldness or a receding hairline.

What are minoxidil’s downsides?

Real, and mostly manageable, but you should know them before comparing it with anything.

  • You have to keep using it. The labels say continued use is necessary or hair loss will begin again. The American Academy of Dermatology (AAD) says the same: stop and you lose the benefit.
  • It is slow. The labels say results may take at least 4 months for the 2% solution and men’s 5% solution, and at least 6 months for the women’s 5% foam. The AAD says about six to 12 months before you know how well it works for you. It “can help early hair loss; it cannot regrow an entire head of hair.”
  • Early shedding. The AAD says you may notice a temporary increase in hair loss for the first two to eight weeks, which stops when regrowth begins. The British Association of Dermatologists (BAD) says four to six weeks. The OTC labels we read don’t mention it. More in shedding more since starting rosemary water.
  • Scalp irritation. The AAD lists dryness, scaling, itching and redness as a common side effect, and says to stop and see a dermatologist if it happens.
  • Hair where you don’t want it. The AAD notes hair can grow on the cheeks and forehead; applying only to the scalp and washing your face afterward limits it. The labels say to stop use and ask a doctor if unwanted facial hair growth occurs. They also warn that some people have noticed changes in hair color or texture.
  • Whole-body symptoms. The label says to stop and ask a doctor for chest pain, rapid heartbeat, faintness or dizziness, sudden unexplained weight gain, or swollen hands or feet. It says to ask a doctor first if you have heart disease.
  • Pregnancy and breastfeeding. The labels say it may be harmful, and the AAD says to avoid it.
  • Pets, especially cats. The ASPCA warns that cats are more sensitive to minoxidil than dogs and that even very small exposures can be life-threatening, including from licking treated skin or lying on a pillow with residue on it. Wash your hands right after applying, keep pets off treated skin and bedding, and get a vet or ASPCA Poison Control (888-426-4435) right away if a pet is exposed.

Label rules also say not to use it if your hair loss is sudden or patchy, if you don’t know the cause, if your scalp is red, inflamed, infected, irritated or painful, if you’re under 18, or, on the women’s labels, if the loss is tied to childbirth.

Can you use rosemary oil with minoxidil?

Nobody has tested that, and the one study near it doesn’t answer the question. Masoud and colleagues (Dermatologic Therapy, 2020) gave 24 men 5% minoxidil plus a topical herbal solution, against 5% minoxidil alone, for nine months. The herbal solution was three ingredients: rosemary, olive and saw palmetto. The combination did better on hair diameter (P=0.001). The difference in hair density between the groups was not significant (P=0.153). With 24 men and a three-herb mix, it can’t tell you what rosemary added.

So the honest answer is that it’s unstudied, with a few things to weigh:

  • Irritation can stack. Minoxidil’s most common problem is scalp irritation. Rosemary caused itching in the Panahi trial, and Gupta’s review says contact dermatitis from rosemary may uncommonly occur. Two products that can each irritate the scalp make it harder to tell which one did it.
  • The label says not to use minoxidil if your scalp is irritated, or if you use other medicines on the scalp. Whether a rosemary product counts as “other medicines” here is a question for a pharmacist.
  • Minoxidil goes on a dry scalp, per the AAD. Oil on the scalp is the opposite situation.
  • Don’t mix them in one bottle, and patch-test the rosemary first.

You will find online schedules like “wait two to four hours between them.” We could not find a controlled study behind any of them, so we won’t give you one. A 2022 review (Gupta and colleagues) does say physicians may suggest natural products alongside topical minoxidil or oral finasteride. That’s something to do on your dermatologist’s say-so, not instead of it.

Can rosemary oil replace minoxidil?

It’s a decision to make with a dermatologist, not a swap. The NHS says finasteride and minoxidil are the main treatments for male pattern baldness, and minoxidil can also be used for female pattern baldness. It also says they don’t work for everyone and only work for as long as they’re used, and that no treatment is 100% effective. The AAD calls minoxidil the most-recommended treatment for female pattern hair loss. Rosemary has one small trial in men.

There are honest reasons someone might want an alternative: scalp irritation on minoxidil, pregnancy or breastfeeding (where rosemary products are not studied either), or hair loss that isn’t pattern loss and so isn’t what minoxidil is for. A 2025 review of topical alternatives (Bikash and colleagues) says they could serve as an add-on, or an alternative for people who can’t tolerate standard therapy. It also lists the problems: small samples, no comparison with standard therapy, uneven groups, undisclosed alopecia type and conflicts of interest. In each case above, the next step is a dermatologist, not a substitution you make yourself.

There is also a cost to waiting. The AAD says treatment for female pattern hair loss works best when it starts at the first sign. A six-month trial of something unproven is six months of the loss continuing, if it is pattern loss.

What about oral minoxidil?

That’s a prescription decision, not something to self-treat. Minoxidil was first prescribed as a tablet for high blood pressure. Increased facial hair in those patients led to the topical version (BAD). Low-dose oral minoxidil is now used off-label for hair loss. A 2021 review of 17 studies and 634 patients (Randolph and Tosti) found it effective and well tolerated in healthy patients who had trouble with topicals, and said larger randomized studies comparing doses are needed.

The side effects are different from the topical. In a retrospective multicenter study of 1,404 patients with no control group (Vañó-Galván and colleagues), the most common was extra hair growth, in 15.1%. Lightheadedness was 1.7%, fluid retention 1.3%, fast heartbeat 0.9%. 1.2% stopped because of systemic effects, and no life-threatening events were seen. An NHS hospital trust leaflet (Gloucestershire) says it is not advised for people already on blood-pressure medication, and that there is no evidence it is safe if you’re trying to conceive, pregnant or breastfeeding. A specialist sets the dose. We are not going to.

What can a rosemary product honestly do?

Be a step in a scalp routine you’ll actually keep up. That’s our read, not a research finding. For pattern hair loss, the research on rosemary is the one trial above. It is not a hair-loss treatment.

If your goal is less breakage, or you’re protecting your edges, what the evidence points to is reducing tension: looser styles, less pulling. No rosemary product replaces that. Preparation, dilution and what suits locs are in rosemary water vs rosemary oil and rosemary oil for locs. Use it because you like how it feels, not because you expect it to regrow hair, and see a dermatologist if your hair is actually thinning.

When should you see a dermatologist?

Sooner than most product pages say. See one if:

  • Your hair loss is sudden or patchy. The minoxidil labels say not to use it in either case. Get it diagnosed first.
  • You don’t know the cause. Same list. The AAD says other causes of hair loss can look like female pattern hair loss, and a dermatologist can rule them out.
  • Your part is widening or your temples are receding. That’s the pattern the AAD describes for women, and it says treatment works best started early.
  • Your scalp is red, painful, inflamed or sore. The label says not to use minoxidil on irritated skin, and irritation isn’t a hair-growth step.
  • Your edges or crown thin along with a tight-style history, or scalp tenderness or burning. That is the traction-or-CCCA conversation, and CCCA can scar.
  • You started minoxidil and see nothing. The label says to stop and ask a doctor if there’s no regrowth by 4 months (2% solution, men’s 5%) or 6 months (women’s foam).
  • You have chest pain, a rapid heartbeat, faintness, dizziness, sudden unexplained weight gain, swollen hands or feet, scalp irritation or redness, or unwanted facial hair growth on minoxidil. Stop use and ask a doctor.

The NHS adds a practical point: see a GP to get an idea of the cause before going to a commercial hair clinic.

Questions people ask

Is rosemary oil stronger than minoxidil?

No evidence says so. The one head-to-head trial found no significant difference from 2% minoxidil. The indirect network meta-analysis put 5% minoxidil ahead of rosemary in men.

Does rosemary oil block DHT?

You’ll see that claim a lot. The support cited in a 2024 review (Bin Rubaian and colleagues) is a mouse-model study of rosemary leaf extract and its effect on the enzyme that makes DHT. We found no human trial of rosemary that measured it. The Panahi trial counted hairs; it didn’t measure DHT.

Will rosemary oil work in three months?

In the one trial, neither rosemary nor minoxidil had produced a significant change at three months. See how long rosemary oil takes to work.

Can women use minoxidil 5%?

The AAD says the FDA has approved non-prescription minoxidil for women, in 2% or 5% products. The 5% for women is a foam used once a day; the label for the 5% solution sold for men says not to use it if you are a woman. In the UK, the BAD says only the 2% strength is licensed for women, and that 5% can be used on professional advice. Which one fits you is a dermatologist or pharmacist question.

Is shedding at the start normal?

The AAD and BAD both describe a temporary increase in the first weeks of minoxidil. Heavy, sudden shedding with scalp pain or bald patches isn’t that. Stop and get it looked at.

Sources

General information, not medical advice. This is not a diagnosis, and we are not telling you to start, stop or swap any medicine. If your hair is thinning, your loss is sudden or patchy, or your scalp is red, painful or sore, see a dermatologist. Ask a pharmacist or your doctor before combining minoxidil with anything else, and call a doctor if you have chest pain, a rapid heartbeat, faintness or dizziness while using it.

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