Shea butter
Shea butter is a well-tolerated emollient, but it has been tested surprisingly little on its own. The best data show a shea-based emollient protecting babies' skin in nappies, and shea appears in moisturisers that helped eczema, but no trial isolates shea as the active. Claims for hair growth and stretch marks are untested. Although it comes from a tree nut, allergy specialists regard refined shea butter as very low risk.
At a glance
Last reviewed 10 October 2026What it's used for
Evidence is rated per use. The same ingredient can be strong for one thing and traditional for another.
| Use | Evidence | What the research shows |
|---|---|---|
| Skin protection and dry skin (emollient)Compare remedies for skin → | Limited | In a 6-week randomised crossover study in babies, a nappy containing an anhydrous shea-based emollient protected against redness: babies were 2.6 times more likely to be free of redness at the perianal site than with a nappy with no emollient, with results similar to a petrolatum-based emollient. In a single-application test in 21 healthy adults, shea butter was no different from water on normal skin and did not reduce irritation from a detergent. No trial tested plain shea butter on adult dry skin.3,1 |
| Eczema (atopic dermatitis) | Traditional | Shea butter is an ingredient in several moisturisers with positive trials, including a device that a meta-analysis of four randomised trials found effective in eczema. That device also contains glycyrrhetinic acid, hyaluronic acid, telmesteine and grape-vine extract, so the result cannot be credited to shea. We found no trial of shea butter alone for eczema.4 |
| Hair conditioning and scalp moisturisingCompare remedies for hair & nails → | Traditional | The Cosmetic Ingredient Review panel lists skin and hair conditioning as the main cosmetic function of shea ingredients, and it is widely used on hair, but that describes how it is used, not a measured effect. We found no trial of shea butter on hair strength, breakage, growth or scalp dryness.5 |
| Chapped lips | Traditional | The American Academy of Dermatology lists shea butter among the ingredients that can help chapped lips. That is professional advice, not a trial of shea butter on lips, and the same page says an ointment such as white petroleum jelly seals in water for longer than waxes or oils.8 |
| Stretch marks | Traditional | A review of clinical studies of plant oils and butters, covering stretch marks in pregnancy, found trials of olive oil and other oils but none of shea butter. So a claim for shea rests on tradition.2 |
How much
Ranges below are what studies used and what supplements commonly contain. They are not a recommendation for you. Start at the low end.
How people take it
Safety
Who should avoid
- Tree nut allergy — risk is thought very low, but ask your allergist first
- Sore or cracked lips — contact allergy to shea butter has been reported in a case of cheilitis
- Eczema in children — treat it under the advice of the doctor treating the rash
- Using it as a stretch-mark or hair-growth treatment — neither has been tested
Known interactions
Questions people ask
Is shea butter good for hair?
It is widely used to condition hair and moisturise the scalp, and it is a common cosmetic conditioning ingredient. We found no trial showing it reduces breakage, speeds growth or treats a dry scalp, so the evidence is traditional.
What are the benefits of shea butter for skin?
It is a fat that softens skin and forms a protective layer. A shea-based emollient in nappies protected babies' skin, and shea is an ingredient in moisturisers that helped eczema. No trial tested plain shea butter against other moisturisers, so we cannot say it works better than a plain, fragrance-free product.
Is shea butter safe if I have a nut allergy?
Shea is a tree nut, but processing greatly reduces the protein, so Allergy UK says the risk of reaction is thought to be very low, and Food Allergy Research and Education (FARE) says it found no documented cases of food allergy reactions to shea nut oil or butter.
A 2011 laboratory letter reported that shea butter contains no IgE-binding soluble proteins. Some people with a tree nut allergy still choose to avoid it, so ask your allergist, especially if you have eczema.
Does shea butter have side effects?
It is well tolerated. The Cosmetic Ingredient Review panel judged shea ingredients safe as used when formulated to be non-sensitising, and human patch tests of products containing it found no sensitisation.
A case report describes contact allergy to shea butter in a person with cheilitis, so stop using it if you develop redness, itching or swelling.
How do you use shea butter on skin and hair?
Warm a small amount between your hands until it melts, then smooth it over damp skin, or through the ends of dry hair. We found no tested amount or schedule, so start with less than you think you need. Patch test on your inner forearm first.
Does shea butter get rid of stretch marks?
There is no evidence that it does. We found no trial of shea butter for stretch marks, so any claim rests on tradition.
Make it yourself
DIY guides that use shea butter, with quantities, safety notes and an honest word on what they do.
Sources (10)
- Controlled trial Lodén M, Andersson AC. Effect of topically applied lipids on surfactant-irritated skin. Br J Dermatol. 1996.
- Review Poljšak N, Kočevar Glavač N. Vegetable Butters and Oils as Therapeutically and Cosmetically Active Ingredients for Dermal Use: A Review of Clinical Studies. Front Pharmacol. 2022.
- Randomised trial O'Connor RJ, Visscher MO, Narendran V, et al. Clinical Evaluation of a Diaper Containing a Shea Butter-Based Emollient and Impact on Diapered Skin Erythema. Pediatr Dermatol. 2025.
- Systematic review Micali G, Paternò V, Cannarella R, Dinotta F, Lacarrubba F. Evidence-based treatment of atopic dermatitis with topical moisturizers. G Ital Dermatol Venereol. 2018.
- Safety review Cosmetic Ingredient Review. Safety Assessment of Butyrospermum parkii (Shea)-Derived Ingredients as Used in Cosmetics. Final report, 2017.
- Patient charity Allergy UK. Tree nut allergy factsheet.
- Patient organisation Food Allergy Research and Education. Tree nut allergy.
- Professional body American Academy of Dermatology. 7 dermatologists' tips for healing dry, chapped lips.
- Laboratory study Chawla KK, Bencharitiwong R, Ayuso R, Grishina G, Nowak-Węgrzyn A. Shea butter contains no IgE-binding soluble proteins. J Allergy Clin Immunol. 2011.
- Case report Castelain F, Aubin F, Pelletier F. Contact allergy to Butyrospermum parkii butter in a patient with cheilitis. Contact Dermatitis. 2024.
Last reviewed 10 October 2026 · Next review April 2027 · How we rate evidence
Reader notes
Experiences and questions from readers, read by an editor before they appear. They are personal accounts, not evidence, and are not medical advice.