Does Oregano Oil Help Hair Growth? What the Studies Show
No human trial, two mouse studies of its main compound, and a strong irritant. What oregano oil has, and has not, been shown to do for hair and scalp.
25sources
25in PubMed
16min read
Written by Nazmi Güldeş, Certified Trichologist · Every source checked against PubMed · Last updated 29 October 2026
Reading level
1Quick answerThe short answer, in a few sentences
No. Using oregano oil for hair growth is not supported by any human study. Our PubMed search on 29 October 2026 found no trial of oregano oil on hair in people. Its main compound, carvacrol, was tested in mice twice: in one study hair grew more slowly, in the other there was no difference.[1][2]
What oregano oil does have is lab evidence against the yeast linked to dandruff,[3][4] and a well-documented ability to irritate skin.[5][6] If you are losing hair, it is not a treatment; if you use it on your scalp at all, dilute it and test it first.
2Complete guideEvery study, how to use it safely and who should avoid it
What Is Oregano Oil?
Oregano (Origanum vulgare) in flower in Keila, Estonia. Photo: Ivar Leidus, CC BY-SA 4.0, via Wikimedia Commons, cropped.
Oregano essential oil is distilled from Origanum vulgare, the same plant used as a kitchen herb. Its main compounds are carvacrol and thymol, which are also found in thyme and savory.[7] In lab and animal research, oregano oils have antimicrobial, antifungal, antioxidant and anti-inflammatory effects.[8] None of these is a hair growth effect.
Carvacrol is also what gives oregano its warm, sharp feel. On the tongue it produces warmth; in lab tests it switches on a warmth-sensing channel found in skin, tongue and nose cells, and another channel that may explain oregano's pungency.[7] That tingle is often taken as a sign that an oil is working on the scalp. It is a nerve response.
Oregano Oil, Oil of Oregano and Infused Oil
Oregano essential oil: the concentrated, distilled oil. This is what the lab studies used, and it must be diluted before it touches skin.[3]
Oil of oregano: usually the same essential oil, often sold already diluted or in capsules to swallow.
Infused oregano oil: dried oregano steeped in a cooking oil. It is far weaker, and its strength is unknown.
None of these forms has been tested for hair growth in people.
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Does Oregano Oil Help Hair Growth? Every Study, Side by Side
A PubMed search for oregano, carvacrol or thymol together with hair, alopecia or scalp returned 23 records on 29 October 2026. Most are about wound dressings, food or plant breeding. None is a trial of oregano oil for hair loss in people. These are the studies that come closest:
Put together, the only direct tests of oregano's main compound on hair found no benefit, and one found harm, in mice. That is weak evidence either way, but it is the opposite of what most oregano oil pages promise.
Clinical detail: the two carvacrol studies in mice
Yan et al. found functional TRPV3 in outer root sheath (ORS) cells; carvacrol induced ORS cell death, and topical carvacrol on murine dorsal skin inhibited hair growth, reversed by TRPV3 inhibition (forsythoside B) or shRNA knockdown.[1] A correction to that paper was published in 2020. Lee and Shim depilated wild-type mice and treated them daily with carvacrol as a TRPV3 agonist: hair growth area and length did not differ significantly from controls at any time point up to day 15.[2] Neither study tested a whole essential oil.
Could Oregano Oil Slow Hair Growth? The TRPV3 Question
There is a reason researchers keep testing carvacrol on hair. It switches on TRPV3, a channel in the skin that responds to warmth.[7] And TRPV3 turns out to be a brake on hair growth, not an accelerator.
In human hair follicles kept alive in the lab, switching TRPV3 on slowed hair shaft growth as the dose rose, killed follicle cells and pushed the follicles into their resting phaseGlossaryCatagen is the short transition phase of the hair cycle, lasting about 1 to 2 weeks. Cell division stops and about two thirds of the lower follicle breaks down, while the dermal papilla stays intact and moves upward. Open in the glossary → early.[9]
In mice, carvacrol on the skin killed cells in the outer layer of the follicle and slowed hair growth.[1]
In people and mice with a faulty, overactive TRPV3 gene, hair falls out. In people this is part of a rare genetic skin disease, Olmsted syndrome.[11][12]
A 2026 study, though, found that carvacrol given to mice every day made no difference to hair growth,[2] and a 2025 review lists TRPV3 as one of six TRP channels that take part in hair growth in humans and mice.[13] So it is not proven that oregano oil slows hair growth in people. But the biology that exists gives no reason to expect it to help.
Clinical detail: TRPV3 in the human hair follicle
In organ-cultured human anagen follicles, TRPV3 immunoreactivity was mainly in the ORS. The plant-derived agonist eugenol (10–1,000 µM) and the synthetic agonist 2-APB (1–300 µM) caused dose-dependent inhibition of hair shaft elongation, reduced proliferation, apoptosis and premature catagen; siRNA silencing of TRPV3 abolished the effects in ORS keratinocytes.[9] The gain-of-function G568V knock-in mouse developed fully penetrant hair loss with premature differentiation of follicular keratinocytes and miniaturised regenerated follicles.[11] Carvacrol activates TRPV3 and also activates, then rapidly desensitises, TRPA1.[7]
Oregano Oil for Hair Growth: Before and After Photos
No study has published before-and-after photos of oregano oil on hair, because no study has tested it on hair in people. Photos online usually come from a single person, with no record of what else they used, and with changes in light, angle and styling that can look like new hair.
If you want to judge any treatment yourself, photograph your scalp in the same light, from the same angles, with dry hair, before you start and again after 3 and 6 months. Our guide to reading before-and-after photos explains what to check. The same photos are what our medical team needs for a free hair analysis.
How to Use Oregano Oil on Your Scalp, If You Still Want To
There is no tested routine for oregano oil on the scalp, so these steps are about avoiding harm rather than getting results:
1.Never apply it undiluted. Carvacrol and thymol can cause skin irritation, inflammation and dermatitis.[5]
2.Mix it into a carrier oil such as coconut or jojoba oil. No study gives a tested dilution for the scalp, so use far less essential oil than carrier oil, or choose a ready-made scalp product and follow its label.
3.Test a small patch of skin first, on the inner arm, and wait a day before using it on your scalp.
4.Keep it on the scalp, away from the eyes, and wash your hands afterwards.
5.Keep contact short and wash it out.
6.Stop at the first sign of redness, burning, itching or flaking.
You can put a diluted oil on your hair lengths, but there is nothing to gain from oregano there. The conditioning effect comes from the carrier oil: in lab tests on hair, coconut oil reduced the protein lost from both damaged and undamaged hair, while sunflower and mineral oil did not.[14]
Can You Leave Oregano Oil in Overnight?
We would not. No study has compared leaving it on with washing it off, and longer contact gives an irritant more time to act on the skin.[5]
Longer contact time raises the chance of irritation, not the chance of growth. Patch test, dilute and wash out.
Oregano Oil in Shampoo
Adding a few drops to shampoo limits contact time, which makes irritation less likely, but there is no trial of oregano shampoo for hair loss or dandruff.
Oregano Oil for Dandruff and Scalp Yeast
This is where oregano oil has its most relevant evidence, and all of it is from the lab. Malassezia yeasts live on normal skin but are linked to dandruff and seborrheic dermatitisGlossarySeborrheic dermatitis causes an itchy, flaky, scaly rash on oily areas such as the scalp. It is the Malassezia-linked condition most people mean by a scalp yeast infection. Open in the glossary →.[15]
Oregano oil and carvacrol stopped the growth of 27 samples of Malassezia furfur taken from patients, including samples resistant to the antifungal drug fluconazole.[3]
Oregano oil and carvacrol also made one Malassezia species less able to stick to surfaces and form biofilms.[4]
A review of essential oils against Malassezia found every oil tested active in the lab. The only two clinical studies it found used lemongrass oils, not oregano.[15]
In a lab comparison of 65 essential oils, oregano was among the most potent against the fungi that cause ringworm of the scalp and skin.[16]
A lab dish is not a scalp. No trial has tested oregano oil on dandruff or scalp ringworm in people. Dandruff has treatments with trial evidence, such as ketoconazole shampoo, and a patchy, scaly or itchy scalp with hair breaking off needs a doctor's diagnosis.
Clinical detail: the Malassezia data
Against 27 clinical isolates of M. furfur, MICs of O. vulgare and T. vulgaris essential oils and carvacrol were 450–900 µg/mL (CLSI broth microdilution modified for Malassezia), with no difference between fluconazole-sensitive and -resistant isolates.[3] Carvacrol was more active and less toxic than the whole oil below 1 mg/mL (toxicity tested in a larval model); oil and carvacrol reduced adherence and biofilm formation of M. sympodialis, and carvacrol reduced the hydrophobicity of both species.[4]
Oregano vs Other Essential Oils for Hair
If you are choosing an essential oil for thinning hair, oregano sits at the bottom of the evidence. The essential oils with some human data are rosemary and a blend used for alopecia areataGlossaryAlopecia areata is an autoimmune condition that can cause round patches of hair loss in the eyebrows, beard or scalp. Hair often regrows within a few months and may look white or grey at first before the natural colour returns. Open in the glossary →, which happened to include thyme, a plant that shares thymol with oregano:
Essential oil
Best evidence for hair
Tested in people?
Rosemary
Best evidence for hair
One randomized trial in 100 men, compared with minoxidil 2%[17]
Tested in people?
Yes, once
Thyme, rosemary, lavender and cedarwood blend
Best evidence for hair
One randomized trial in alopecia areata: 44% improved vs 15% with carrier oil[18]
Many pages say oregano oil boosts blood flow to hair follicles. We found no study that measured scalp blood flow with oregano oil.
The massage may matter more than the oil. In a small Japanese study, 9 healthy men used a scalp massage device for 4 minutes a day. After 24 weeks their hairs were slightly thicker, 0.092 mm against 0.085 mm at the start. The study also counted hairs, but its summary reports only the change in thickness.[21] It used no oil and only 9 men, so even that result is tentative.
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Carvacrol, thymol and eugenol are generally considered safe in food, but on human skin they can cause irritation, inflammation, ulcers, dermatitis and slow healing.[5] A 2020 report in Contact Dermatitis described irritant dermatitis after what its authors called a curious therapeutic use of oregano essential oil.[6] The same compounds are known skin sensitizers, which means repeated use can lead to an allergy.[7]
Allergic Reactions
Oregano contains allergens that cross-react with other spices and with plant pollen.[22] Oregano belongs to the mint family, along with sage, mint and thyme. A 13-year-old boy developed angioedema, a deep swelling under the skin, after eating a dish that contained oregano; food challenges later showed he reacted to oregano, sage and mint.[23]
Who Should Not Use It Without Asking a Doctor
Anyone allergic to oregano, thyme, sage, mint or other mint-family herbs.[23][22]
Anyone with a red, broken, sore or flaking scalp.
People who are pregnant or breastfeeding: we found no safety studies of oregano oil on the skin in pregnancy.
Children.
Anyone in the first weeks after a hair transplant.
Clinical detail: toxicology of the phenolic compounds
Oxidative stress is the main proposed mechanism of carvacrol, thymol and eugenol cytotoxicity; mutagenic and genotoxic effects have been observed occasionally, and acute and prolonged carvacrol and thymol exposure produced adverse effects in mice, rats and rabbits.[5] Oregano contains Bet v 1-type allergens and profilins.[22]
Why Is Oregano Oil Linked to Hair Growth Online?
Three things make the claim spread. Oregano oil is sold as a strong natural antimicrobial, and that reputation is stretched to the scalp.[8] Rosemary, another kitchen herb, has a hair loss trial,[17] and claims made for one herbal oil are easily borrowed for another. And carvacrol produces a warm, tingling feeling on skin,[7] which feels like something is happening.
None of the three is evidence of hair growth. A pleasant smell or a tingle tells you about the nerves in your skin, not about your hair follicles.
When Oregano Oil Is Not Enough
See a doctor rather than trying oils if:
your hair falls out suddenly, or in round patches;
your scalp is red, scaly, sore or itchy, or hairs are breaking off;
you can see more scalp month by month;
the hair loss came with other symptoms, such as tiredness or weight change.
A 2025 Canadian expert consensus recommends seven treatments for pattern hair loss: finasteride and dutasteride tablets, finasteride and minoxidilGlossaryMinoxidil is an established medication for certain types of hair loss. It is a drug, not a hair oil, and the FDA-approved label says not to use it for sudden or patchy hair loss. Open in the glossary → applied to the scalp, minoxidil tablets, platelet-rich plasma and microneedling. It lists topical herbal formulations and rosemary oil among the treatments it does not recommend.[24] Our guide to why hair falls out covers the common causes, and men can check their stage with the Norwood test and graft calculator.
When the Hair Is Already Gone
No oil regrows hair on smooth, bald skin. Where the hair is already gone, a hair transplant is the option that puts hair back: follicles are moved from areas where hair is not thinningGlossaryThe donor area is the back and sides of the head, where follicles resist DHT. An extracted follicle does not grow back in that spot, so extractions are spread out, and the donor supply is the limit of every plan. Open in the glossary → and keep that resistance in their new place, a principle called donor dominance. Medical treatment is often continued alongside it to protect the hair that is still there.[25]
Should You Use Oregano Oil on Your Hair? Our Verdict
Not for hair growth. There is no human evidence that it helps, and the only direct tests of its main compound found slower growth or no change in mice. Its one plausible use on the scalp, against dandruff yeast, rests on lab studies, and it carries a real risk of irritation.
If you want an essential oil for thinning hair, rosemary has more evidence, though still little.
If you have dandruff, use a treatment that has been tested on scalps.
If you use oregano oil anyway, dilute it, patch-test it, keep contact short and stop at the first sign of irritation.
If your hair is thinning, find out why before spending months on any oil.
Frequently Asked Questions
Does oregano oil help hair growth?
There is no evidence that it does. No study has tested it on hair growth in people, and the two mouse studies of its main compound, carvacrol, found slower growth or no change.[1][2]
Can you put oregano oil directly on your scalp?
No. Its main compounds can irritate and inflame skin, and dermatologists have reported irritant dermatitis after oregano essential oil was used as a treatment.[5][6] Always dilute it in a carrier oil and test a small patch of skin first.
Can I leave oregano oil in my hair overnight?
We do not recommend it. Longer contact means more time for irritation, and there is no hair benefit to gain from it. If you use a diluted oil, wash it out after a short time.[5]
Is oregano oil good for dandruff?
In lab dishes, oregano oil and carvacrol stop the growth of Malassezia, the yeast linked to dandruff.[3][4] No trial has tested it on a flaky scalp, while shampoos such as ketoconazole have been.
Does oregano oil block DHT?
We found no study that measured DHT in people or animals using oregano oil. The DHT claim is borrowed from other plants.
Can oregano oil cause hair loss?
We found no reported case of hair loss from oregano oil in people. In one mouse study its main compound slowed hair growth,[1] and an irritated, inflamed scalp is not a good place for hair to grow.
Is oregano oil better than rosemary oil for hair?
No. Rosemary oil has one randomized trial in men with pattern hair loss;[17] oregano oil has none. See our Rosemary Oil for Hair Loss entry.
Can oregano oil capsules help hair grow?
We found no study of oregano oil taken by mouth for hair growth in people. If you are losing hair, a diagnosis is a better first step than a supplement.
Can I use oregano oil after a hair transplant?
Do not put essential oils on the grafts or the donor area unless your surgical team agrees. Follow your written aftercare plan.
3 questions
Test yourself
Check what you remember from this entry. Each answer links back to the section that explains it.
What did the two mouse studies of carvacrol, oregano's main compound, find?
One found slower hair growth and the other found no difference. Neither found a benefit. Read the section
In lab tests, what does oregano oil act against?
It stopped the growth of Malassezia yeast in lab dishes; it has not been tested on scalps. Read the section
How should oregano essential oil go on the scalp, if at all?
Its compounds irritate skin, so dilute it, test it and keep contact short. Read the section
3Scientific evidenceStudy types, references and how to cite this entry
25sources
Evidence behind this entry: 25 publications indexed in PubMed (1998–2026): 7 lab studies, 7 reviews, 5 animal studies, 2 case reports, 2 randomized trials, 1 clinical study and 1 guideline. 9 have free full text. One has a published correction, shown in the references.
Randomized trialpeople assigned to treatments by chance
Reviewsummarises many studies
Clinical studya study in people without random groups
Yan K, Sun X, Wang G, et al. Pharmacological Activation of Thermo-Transient Receptor Potential Vanilloid 3 Channels Inhibits Hair Growth by Inducing Cell Death of Hair Follicle Outer Root Sheath. Journal of Pharmacology and Experimental Therapeutics. 2019;370(2):299-307.Animal studyPubMedDOIA correction to this article was published: J Pharmacol Exp Ther. 2020;372(3):265 (PubMed).
Lee WJ, Shim WS. TRPV4 Activation Promotes Hair Growth via TSLP Signaling in the Skin. Biomolecules & Therapeutics. 2026;34(4):942-952.Animal studyPubMedDOIFree full text
Vinciguerra V, Rojas F, Tedesco V, et al. Chemical characterization and antifungal activity of Origanum vulgare, Thymus vulgaris essential oils and carvacrol against Malassezia furfur. Natural Product Research. 2019;33(22):3273-3277.Lab studyPubMedDOI
Angiolella L, Rojas F, Mussin J, et al. Modulatory effect of Origanum vulgare essential oil and carvacrol on Malassezia spp. virulence factors. Medical Mycology. 2023;61(3):myad026.Lab studyPubMedDOI
Fuentes C, Fuentes A, Barat JM, et al. Relevant essential oil components: a minireview on increasing applications and potential toxicity. Toxicology Mechanisms and Methods. 2021;31(8):559-565.ReviewPubMedDOI
Lauriola MM, Sena P, De Bitonto A, et al. Irritant contact dermatitis after a curious therapeutic use of oregano essential oil. Contact Dermatitis. 2020;83(2):129-130.Case reportPubMedDOI
Xu H, Delling M, Jun JC, et al. Oregano, thyme and clove-derived flavors and skin sensitizers activate specific TRP channels. Nature Neuroscience. 2006;9(5):628-635.Lab studyPubMedDOI
Leyva-López N, Gutiérrez-Grijalva EP, Vazquez-Olivo G, et al. Essential Oils of Oregano: Biological Activity beyond Their Antimicrobial Properties. Molecules. 2017;22(6):989.ReviewPubMedDOIFree full text
Borbíró I, Lisztes E, Tóth BI, et al. Activation of transient receptor potential vanilloid-3 inhibits human hair growth. Journal of Investigative Dermatology. 2011;131(8):1605-1614.Lab studyPubMedDOI
Hosny KM, Rizg WY, Alfayez E, et al. Preparation and optimization of aloe ferox gel loaded with Finasteride-Oregano oil nanocubosomes for treatment of alopecia. Drug Delivery. 2022;29(1):284-293.Lab studyPubMedDOIFree full text
Song Z, Chen X, Zhao Q, et al. Hair Loss Caused by Gain-of-Function Mutant TRPV3 Is Associated with Premature Differentiation of Follicular Keratinocytes. Journal of Investigative Dermatology. 2021;141(8):1964-1974.Animal studyPubMedDOIFree full text
Lu A, Li K, Huang C, et al. Pathogenesis and management of TRPV3-related Olmsted syndrome. Frontiers in Genetics. 2024;15:1459109.ReviewPubMedDOIFree full text
Zhang H, Paus R, Dai Y, et al. Transient receptor potential channels in hair follicle biology: physiological significance and translational relevance. British Journal of Dermatology. 2025;193(6):1065-1074.ReviewPubMedDOI
Rele AS, Mohile RB. Effect of mineral oil, sunflower oil, and coconut oil on prevention of hair damage. Journal of Cosmetic Science. 2003;54(2):175-192.Lab studyPubMed
Donato R, Sacco C, Pini G, et al. Antifungal activity of different essential oils against Malassezia pathogenic species. Journal of Ethnopharmacology. 2020;249:112376.ReviewPubMedDOI
Parrish N, Fisher SL, Gartling A, et al. Activity of Various Essential Oils Against Clinical Dermatophytes of Microsporum and Trichophyton. Frontiers in Cellular and Infection Microbiology. 2020;10:545913.Lab studyPubMedDOIFree full text
Panahi Y, Taghizadeh M, Marzony ET, et al. Rosemary oil vs minoxidil 2% for the treatment of androgenetic alopecia: a randomized comparative trial. Skinmed. 2015;13(1):15-21.Randomized trialPubMed
Hay IC, Jamieson M, Ormerod AD. Randomized trial of aromatherapy. Successful treatment for alopecia areata. Archives of Dermatology. 1998;134(11):1349-1352.Randomized trialPubMedDOI
Oh JY, Park MA, Kim YC. Peppermint Oil Promotes Hair Growth without Toxic Signs. Toxicological Research. 2014;30(4):297-304.Animal studyPubMedDOIFree full text
Lee BH, Lee JS, Kim YC. Hair Growth-Promoting Effects of Lavender Oil in C57BL/6 Mice. Toxicological Research. 2016;32(2):103-108.Animal studyPubMedDOIFree full text
Koyama T, Kobayashi K, Hama T, et al. Standardized Scalp Massage Results in Increased Hair Thickness by Inducing Stretching Forces to Dermal Papilla Cells in the Subcutaneous Tissue. Eplasty. 2016;16:e8.Clinical studyPubMedFree full text
Lisiecka MF. Allergic reactions to spices: a review of sensitivities to pepper, cumin, oregano, anise, mustard and other spices. European Annals of Allergy and Clinical Immunology. 2026;58(2):51-60.ReviewPubMedDOI
Yazıcı S, Nacaroglu HT, Bahçeci Erdem S, et al. Angioedema Due to Lamiaceae Allergy. Iranian Journal of Allergy, Asthma and Immunology. 2018;17(1):97-99.Case reportPubMed
Landells I, Chow E, Gupta AK, et al. A Canadian Consensus on Androgenetic Alopecia: Approach and Management. Journal of Cutaneous Medicine and Surgery. 2025;29(5_suppl):5S-14S.GuidelinePubMedDOIFour of the 15 authors are listed as working for L'Oréal Canada; the paper declares no conflicts of interest.
Queen D, Avram MR. Hair Transplantation: State of the Art. Dermatologic Surgery. 2025;51(9):874-881.ReviewPubMedDOI
Written byNazmi Güldeş, Certified Trichologist
Sources checked29 October 2026, against PubMed
Last updated29 October 2026
Cite this entry
Güldeş, N. (2026, October 29). Does oregano oil help hair growth? What the studies show. Turkey Hair Center Hair Library. https://turkeyhaircenter.com/oregano-oil-for-hair-growth/
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