Does Rosemary Oil Help Hair Loss? What the Study Shows
10 min read Ingredients Updated 5 October 2026 By Anna Sophie Schulenburg
The evidence on rosemary oil for hair loss rests essentially on a single comparison study from 2015, with 100 men and no placebo group, and that is too little to promise anything. If you want to try it anyway, dilute two to three drops of rosemary essential oil in 10 ml of jojoba oil, test the blend in the crook of your elbow for two days, then massage it into your scalp two to three times a week. Photos of your parting, taken every four weeks in the same light for at least six months, will show you whether anything is changing.
Does rosemary oil help with hair loss? The verdict first
A trial with diluted rosemary oil is reasonable if your scalp is healthy, your hair has been thinning slowly over months and you can stay patient for six months. It is unsuitable for sudden or patchy shedding, for an irritated scalp and as a replacement for a treatment your doctor has prescribed.
Rosemary oil is a cosmetic with thin data. Nobody can tell you in advance what it will do on your head. Before you start, also work out whether your hairs are falling out at the root or snapping along the length. Oil on the scalp does nothing for breakage. Telling hair breakage from hair loss takes a single fallen hair: one that has fallen out carries a small pale bulb at its end, and a snapped one has none.
What is in rosemary oil and what it does on the scalp
Rosemary essential oil is steam-distilled from the leaves and flowering tips of the plant. It consists almost entirely of volatile aromatic compounds, chiefly 1,8-cineole, camphor and alpha-pinene. They give the oil its cool, resinous smell. And they are the reason the neat oil can sting and redden the skin and, over time, trigger a contact allergy.
The explanation usually offered alongside it comes from laboratory experiments published in 2013. There, an extract of rosemary leaves slowed the enzyme 5-alpha reductase, which converts testosterone into dihydrotestosterone (DHT). In people with the relevant predisposition, DHT shrinks the hair follicles over years. In men this is the central mechanism of hereditary hair loss; in women DHT plays a smaller and less clear-cut role. The extract was tested on cells and on mice. An essential oil on a human head is a different product in a different situation.
The evidence: what the 2015 study shows and what it leaves open
Almost every post on the subject cites a randomised comparison study published in 2015 in the journal Skinmed. For six months, 100 men with hereditary hair loss applied either a rosemary oil preparation or a two per cent minoxidil solution to their scalps. Their hairs were counted after three and after six months.
After three months, neither group showed any change. After six months, the authors reported more hairs than at the start in both groups, with no meaningful difference between rosemary and minoxidil. Scalp itching was more common in the minoxidil group. Social media turned this result into the claim “as good as minoxidil”. The table shows why the study cannot carry that.
| Question | What the study offers on it |
|---|---|
| Who was studied? | Only men with hereditary hair loss. It says nothing about women, or about shedding after stress, childbirth or iron deficiency. |
| How large was it? | 100 participants in two groups. A solid conclusion needs several larger studies with matching results. |
| Was there a placebo group? | No. Without a comparison against an oil with no active ingredient, there is no way to separate what the rosemary oil contributed from the effect of massage, season or chance. |
| How strong was the comparison product? | Minoxidil in a two per cent solution. The stronger solution is usual for men, so the comparison was made with the weaker version. |
| How long did it run? | Six months. After three months nothing was visible in either group. |
| Which product was tested? | One specific preparation, applied in a set way. Nobody knows whether your home blend matches it. |
There is also an older study from 1998 on alopecia areata, the condition behind round bald patches. It tested a blend of several essential oils, including rosemary, thyme, lavender and cedarwood. From that blend there is no telling how much the rosemary contributed, and a study of round bald patches says nothing about hair that thins slowly in any case.
Does a rosemary oil trial suit your situation?
| Your situation | What you do with rosemary oil |
|---|---|
| Your hair has been thinning evenly for months, your scalp is calm | A six-month trial is reasonable, with photos as your check. |
| For a few weeks you have been losing more hair all over | Look for the trigger first: an infection, childbirth, a diet or stress as a cause of hair loss often lies two to three months back. |
| Round bald patches, clumps in your hand or a parting that has widened clearly within a few months | See a dermatologist before you apply anything. |
| Your scalp itches, burns, flakes heavily or has open patches | Leave essential oils out and calm your sensitive scalp first. |
| Your hair snaps along the length, the root is fine | Rosemary oil on the scalp changes nothing here. Care for your lengths and cut down on friction and heat. |
If two rows fit you, the free hair analysis sorts your answers on scalp, shedding and breakage.
How to use rosemary oil if you want to try it
You need pure rosemary essential oil in a dark glass bottle and a carrier oil. Jojoba oil is light and washes out well; almond oil works too. Avoid steeping your own herbal oil with fresh sprigs: the leaves bring water into the oil, and that is where mould can grow.
Step 1 — Mix. For 10 ml of jojoba oil, use two to three drops of rosemary essential oil. For 30 ml, roughly two tablespoons, that makes six to nine drops. At three applications a week, it lasts two to four weeks. Pour the blend into a dark dropper bottle and give it a quick shake before each use.
Step 2 — Test. Put one drop of the finished blend in the crook of your elbow and leave it there for 48 hours. Redness, itching, weals or burning mean you should not use it. If the skin stays calm, the blend can go on your scalp.
Step 3 — Massage in. Divide dry hair into partings about two centimetres apart and place the dropper directly on the scalp, a few drops per parting. Half a teaspoon to a full teaspoon is enough for the whole head. Massage for two to three minutes with your fingertips in small circles, keeping your nails off the skin. Keep the oil away from your eyes and wash your hands afterwards.
Step 4 — Leave on and wash out. Leave the blend on your scalp for at least two hours or overnight. Then shampoo twice: the first wash loosens the oil, the second cleans the scalp. Conditioner goes on the lengths only.
If your roots still look stringy after the second wash, you used too much oil. Use half the amount next time.
Three mistakes that spoil the trial, and what to do instead:
- Dripping essential oil neat onto the scalp → always two to three drops per 10 ml of carrier oil.
- Oiling every day and shampooing only once → two to three times a week, always followed by two washes.
- Judging after four weeks → decide only after six months, based on the photos.
Rosemary water, shampoo or oil: which form is worth it
| Form | Verdict | Why |
|---|---|---|
| Essential oil, diluted in a carrier oil | The most sensible form if you try it | Stays on the scalp for hours. Needs the elbow test. |
| Essential oil, neat | Leave it | Can sting, redden and trigger a contact allergy. |
| Rosemary water, brewed like tea and sprayed on | Harmless, but without data | Contains far fewer volatile oils. Keeps three to four days in the fridge. |
| Shampoo with rosemary | A pleasant scent and nothing more | Stays on the scalp for about a minute before it is rinsed off. |
| Ready-made rosemary hair oil | Read the INCI list first | If “Rosmarinus Officinalis Leaf Oil” or “Salvia Rosmarinus Leaf Oil” sits near the end, there is little of it inside. |
The second home remedy often named alongside rosemary is caffeine. What caffeine shampoo can do for hair loss depends mainly on contact time, and with a shampoo that time is short.
When to leave rosemary oil out
- With a reddened, heavily flaking or inflamed scalp, or with eczema or psoriasis on the scalp. Fragrance compounds put extra strain on skin that is already damaged.
- During pregnancy and breastfeeding. There is no data on rosemary essential oil for this period; talk to your doctor or midwife first.
- If you have epilepsy. Camphor and cineole are considered unfavourable for seizure disorders, so ask your doctor.
- If you react allergically to lavender, sage, thyme or mint. Rosemary belongs to the same plant family, the Lamiaceae, and a risk of cross-allergy cannot be ruled out.
- For children. Oils containing cineole and camphor do not belong near the face and airways of small children.
When to see a dermatologist
Round bald patches, clumps in your hand, shedding after a new medication or a scalp that hurts, weeps or flakes heavily belong with a dermatologist. Behind each of these signs there can be a cause that needs a diagnosis: iron deficiency, a thyroid disorder, inflammation of the hair follicles or alopecia areata. At the appointment, ask about ferritin and thyroid levels if they are not tested anyway.
If your parting widens over the years, as is typical of hereditary hair loss, there are pharmacy products and medical treatments with far broader evidence than rosemary oil; which of them suits you is something to settle with your dermatologist. For the hair you have, light care is enough alongside that: conditioner only from ear level down and no oil at the roots. How to care for thinning hair without weighing down the roots comes down mainly to the amount you use per wash.
What to watch for after four weeks, three months and six months
Take a baseline photo before the first application: your parting from above, at the window in daylight, from about 30 cm away, with the same parting as always. Repeat it every four weeks under the same conditions.
| Time | What you look for |
|---|---|
| After the first application | If your scalp burns or itches, wash the blend out straight away and stop. |
| After four weeks | Is your scalp calm and are your roots clean after washing? First comparison photo. |
| After three months | In the study, neither group showed a difference at this point. Keep taking photos and hold off on judging. |
| After six months | Lay the photos side by side. If you see no difference at your parting, you can end the trial. |
If you care for your hair with MONAT
The IR Clinical™ System is designed for thinning hair. The shampoo and conditioner make each strand feel grippier and look thicker, and the serum goes on the scalp. It cares for the hair you have and remains a cosmetic; it does not treat hair loss. REJUVENIQE® is a care oil for pre-wash treatments and the lengths, with a distinct scent of its own; with a sensitive scalp, the elbow test applies here too.
What care can do
Support cleansing, conditioning, manageability, shine, frizz control, protection from avoidable breakage and a fuller-looking appearance, depending on the product and its substantiated claims.
What it cannot do
Diagnose disease, correct hormonal causes, create new follicles or permanently fuse fully split hair ends.
Quick questions
Does rosemary oil help women with hair loss?
That has not been studied. In women, other triggers are more often behind the shedding, such as iron deficiency, the thyroid or a hormonal change. A blood test can clarify these triggers.
Does rosemary oil make hair grow faster?
No, there is no evidence for that. Scalp hair grows about one centimetre a month. The 2015 study recorded only the number of hairs; length was never measured.
Can I combine rosemary oil and minoxidil?
Only after talking to your dermatologist. Using both on the same scalp can increase irritation, and whether an oil changes how the solution is absorbed has not been studied.
Will my hair smell of rosemary afterwards?
Yes, until the next wash. The scent is strong and resinous; if you would rather not sleep with it, apply the blend in the afternoon and wash it out in the evening.
How long does a home-made blend keep?
A few months, if it is stored dark, cool and tightly closed. Jojoba oil hardly goes rancid, but the essential oil loses its scent over time. If the blend smells musty or sharp, pour it away.
Before you buy rosemary oil, the free hair analysis sorts out whether your scalp, shedding or breakage is the main issue for you.