Peppermint Oil for Hair: Benefits, Evidence and How to Use It Safely
Last reviewed on 1 August 2026. We review our treatment guides every six months to keep them accurate.
Peppermint oil has become one of the more talked-about natural oils in hair care, and most searches for peppermint oil for hair ask the same thing: does it actually grow hair, or is it simply a pleasant, cooling scalp oil? The honest answer is that the evidence is thin. The popular idea that peppermint oil promotes hair growth rests almost entirely on a single mouse study, with no human trial to confirm it, so any growth benefit in people is unproven. What peppermint oil reliably offers is a cooling, tingling sensation and a fresh scent, which can make it a pleasant addition to a scalp-care routine. This guide sets out what the research does and does not show, the possible blood-flow mechanism, how to dilute and use it, whether you can leave it in, and how to use it safely.
What Is Peppermint Oil?
Peppermint oil is an essential oil distilled from the peppermint plant (Mentha piperita). Its main active component is menthol, which gives it the familiar cooling tingle, sharp fragrance and mild numbing feel. As a concentrated essential oil it is potent, so it is meant to be diluted in a carrier oil rather than used neat on the skin. As DermNet notes, menthol, the chief constituent of oil of peppermint, is an irritant in high concentration, which is exactly why dilution matters.
Does Peppermint Oil Actually Grow Hair?
This is the question behind most searches, so it deserves a straight answer. The claim that peppermint oil promotes hair growth comes almost entirely from one 2014 study in the journal Toxicological Research. In it, researchers applied 3% peppermint oil to the shaved skin of mice for four weeks and compared it with saline, jojoba oil and 3% minoxidil (a proven hair-loss treatment). The peppermint oil group showed the most hair growth of all four groups, with more and deeper hair follicles, and the researchers linked this to an increased blood supply to the follicle and a rise in a growth signal called IGF-1.
Those results sound impressive, but they need to be read with real caution. This was a single study carried out in mice, not people. Mouse hair grows in coordinated cycles that do not match human hair, so a strong result in mice often does not carry across to humans. There has been no human trial to confirm that peppermint oil regrows hair or slows hair loss. In short, the growth claim is genuinely unproven in people, and it is not accurate to describe peppermint oil as a treatment for pattern baldness.
The Benefits of Peppermint Oil for Hair
Peppermint oil's realistic benefits are mostly cosmetic: a cooling, refreshing sensation, a possible mild boost to scalp blood flow, and a fresh scent.
Setting the unproven growth claim aside, peppermint oil does have some realistic, mostly cosmetic, appeal for hair and scalp care:
- A cooling, refreshing sensation: the menthol in peppermint oil creates a tingling, cooling feeling on the scalp that many people find pleasant, especially in a massage oil or a clarifying scalp treatment.
- A possible blood-flow effect: menthol can widen small blood vessels, and the mouse study put its effect down to increased blood supply to the follicle. In theory, better local blood flow could support the follicle, but this remains a proposed mechanism rather than a proven benefit in people.
- A fresh scent and light feel: its sharp, minty fragrance and non-greasy feel make it a popular addition to shampoos, conditioners and scalp oils.
What the evidence does not support is peppermint oil as a stand-alone cure for hair loss. Treat it as a pleasant scalp oil rather than a medicine.
How to Use Peppermint Oil for Hair
Because peppermint essential oil is potent, the single most important rule is to dilute it. DermNet advises not applying neat, undiluted essential oils to the skin, as this can cause irritation and lead to sensitisation. A sensible approach is:
- Dilute it in a carrier oil: mix a few drops of peppermint oil into a carrier such as jojoba, coconut or almond oil. A low concentration, in the region of 2 to 3% (roughly 2 to 3 drops of essential oil per teaspoon of carrier), is plenty. Never apply it neat.
- Patch test first: dab a little of the diluted blend on a small area, such as the inner forearm or behind the ear, and wait 24 hours to check for redness, itching or a burning feeling before using it on your scalp.
- Massage into the scalp: apply the diluted oil and massage gently. Keep it well away from the eyes, as the menthol vapour stings.
- Or add a couple of drops to shampoo: stirring a drop or two into a normal dose of shampoo is a gentler way to enjoy the cooling feel without a strong leave-on dose.
A little goes a long way. If you feel more than a mild, pleasant tingle, or any burning or stinging, rinse it out.
Is Peppermint Oil Safe? Side Effects and Precautions
Used sensibly and well diluted, peppermint oil is generally well tolerated, but as a strong essential oil it carries a few risks worth knowing:
- Skin irritation and burning: DermNet notes that menthol, the main component of peppermint oil, is irritant in high concentration. Applied neat or too strong, it can cause redness, stinging or a burning sensation.
- Allergic contact dermatitis: some people become allergic to menthol or peppermint, developing itching, redness or a rash. DermNet reports that both irritant and allergic contact dermatitis have been linked to peppermint and menthol.
- Eyes and sensitive areas: keep peppermint oil away from the eyes, nose and broken skin, where the menthol vapour and oil can sting and irritate.
- Young children: take particular care around babies and young children. Menthol-containing products are best kept well away from them, so peppermint oil is not suitable for use on infants.
If you have sensitive skin, a known allergy, or a scalp condition such as eczema or psoriasis, check with a pharmacist or your doctor before using peppermint oil.
Can You Leave Peppermint Oil in Your Hair?
You should never leave neat, undiluted peppermint essential oil on your skin. Well diluted in a carrier oil, a small amount can be left on the scalp for a short leave-on treatment, for example 15 to 20 minutes, and then washed out. Leaving a diluted blend on for longer, or overnight, is only worth trying for people who know they tolerate it well, and always in a low concentration. If you notice any burning, stinging, itching or redness at any point, rinse it out straight away rather than leaving it on.
Peppermint Oil Compared With Other Options
Peppermint oil is one of several plant oils promoted for hair. Rosemary oil is the better-studied comparator, with a small trial that compared it to minoxidil, while oils such as avocado oil and pumpkin seed oil are used mainly for conditioning or, in pumpkin seed oil's case, as a proposed natural DHT blocker. You can read more about that wider group in our guide to the best natural DHT blockers. None of these oils has the weight of evidence behind it that the standard medical treatments do.
According to the NHS, the two main treatments for male pattern baldness are finasteride and minoxidil, with minoxidil also used for female pattern hair loss (the NHS notes that women should not use finasteride). You can read more in our minoxidil hair loss guide and our finasteride guide. Any medicine should be discussed with your doctor.
The Bottom Line
Peppermint oil is a refreshing, cooling scalp oil with a pleasant scent, and one mouse study hints at a possible effect on hair growth through improved blood flow. But there is no human evidence that it regrows hair or treats hair loss, so it is best enjoyed for the feel and the fragrance rather than relied on as a treatment. If you are genuinely worried about thinning or shedding, the NHS advises seeing a GP to find the cause, as some hair loss is temporary and treatable once the reason is known.
Frequently Asked Questions
Does peppermint oil really promote hair growth?
The claim comes from a single 2014 mouse study, in which 3% peppermint oil produced more hair growth than minoxidil in mice. There has been no human trial, so in people the growth benefit is unproven. It is best thought of as a pleasant scalp oil rather than a proven hair-loss treatment.
What are the benefits of peppermint oil for hair?
Realistically, the benefits are cosmetic: a cooling, refreshing sensation, a fresh scent, and possibly a mild boost to scalp blood flow from the menthol. Any effect on actual hair growth in humans is not established.
Can I leave peppermint oil in my hair?
Only when it is well diluted in a carrier oil and used in small amounts, and even then a short leave-on treatment that you wash out is safest. Never leave neat, undiluted essential oil on your skin, and rinse it out straight away if you feel any burning or irritation.
How do I dilute peppermint oil for my hair?
Mix a few drops of peppermint essential oil into a carrier oil such as jojoba, coconut or almond oil, aiming for a low concentration of around 2 to 3%. Patch test the blend first, and never apply peppermint oil neat.
Is peppermint oil safe to use on the scalp?
For most people, well-diluted peppermint oil is well tolerated on the scalp. Because menthol is irritant in high concentration, it can cause stinging, redness or an allergic reaction if used too strong or neat. Keep it away from the eyes, take care around young children, and stop using it if your skin reacts.
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