Butyrospermum Parkii (Shea) Butter

What it is

Shea butter is pressed from the kernels of the West African shea tree, listed in cosmetics under its older botanical name Butyrospermum parkii (now Vitellaria paradoxa). Around 85 to 90% of it is ordinary fatty acids, mostly oleic and stearic, but it has an unusually large unsaponifiable fraction of triterpene esters and plant sterols, which is what distinguishes it from a plain vegetable fat. It melts at body temperature, so formulators use it both as a rich emollient and as a natural way to thicken a cream or a mask.

What it does well

• Strong, long-lasting protection against water loss

  Its high stearic acid content makes it solid at room temperature and slow to absorb, so it stays on the surface longer than a liquid oil. Reviews of plant oils in dermatology consistently list shea among the more effective occlusive plant fats for very dry skin.

  Moderate evidence

• Performed comparably to a ceramide product in childhood eczema

  In a 34-patient open study in children with atopic dermatitis, a cream containing shea butter extract was acceptable to about three quarters of patients and showed no difference in efficacy from a ceramide-precursor moisturiser tested previously. The study was small, unblinded and not placebo controlled.

  Limited evidence

• The unsaponifiable fraction has anti-inflammatory activity

  Shea's triterpene alcohols and cinnamate esters show anti-inflammatory effects in laboratory work summarised in dermatology reviews of plant oils. This has not been translated into a controlled clinical trial of shea butter as a treatment.

  Limited evidence

Worth knowing

• Rare but genuine contact allergy

  Allergic contact dermatitis to shea butter is documented, including a 2024 case of cheilitis confirmed by patch testing. It is uncommon enough that shea remains a mainstream ingredient, but it is not a zero-risk material.

  Matters most toPeople with persistent lip or eyelid dermatitis who have not identified a cause.

• Rich texture can be too much for oily or blemish-prone skin

  Shea is dominated by oleic and stearic acid rather than linoleic acid, and heavy occlusive fats are more often reported to aggravate congestion. This is a texture and tolerance question, not a safety one, and it varies a lot between individuals.

  Matters most toPeople with oily or acne-prone skin using rich leave-on masks.

• Widely assumed to be dangerous for people with nut allergy

  This concern is largely unfounded. Shea is not one of the nuts EU food law requires to be declared as an allergen, cosmetic shea butter is a refined fat containing very little protein, and there is no established pattern of reactions in tree-nut allergic patients. The Cosmetic Ingredient Review panel assessed shea-derived ingredients as safe when formulated to be non-sensitising.

  Matters most toPeople with tree-nut allergy who have been told to avoid shea; worth discussing with an allergist rather than assuming.

Where the EU stands

Sources (3)

Every link goes to the original: a journal, a PubMed record or an EU document.

1. [1]
   Safety Assessment of Butyrospermum parkii (Shea)-Derived Ingredients as Used in Cosmetics

   International Journal of Toxicology (Cosmetic Ingredient Review) · 2024 · doi:10.1177/10915818231224230

   The expert panel concluded that thirteen shea-derived cosmetic ingredients are safe in current practices of use and concentration when formulated to be non-sensitising.

2. [2]
   Contact allergy to Butyrospermum parkii butter in a patient with cheilitis

   Contact Dermatitis · 2024 · doi:10.1111/cod.14478

   A patch-test-confirmed case report showing that shea butter can, uncommonly, act as a contact allergen.

3. [3]
   Patient acceptability, efficacy, and skin biophysiology of a cream and cleanser containing lipid complex with shea butter extract versus a ceramide product for eczema

   Hong Kong Medical Journal · 2015 · doi:10.12809/hkmj144472

   A shea butter cream was acceptable to about three quarters of children with atopic dermatitis and did not differ in efficacy from a ceramide-precursor moisturiser, in a small uncontrolled study.