Shea butter

Shea Butter (Vitellaria paradoxa): A Comprehensive Reference

1. Identity: Botanical Name, Source, and Common Forms

1.1 Botanical and Chemical Identity

The shea tree (Vitellaria paradoxa C.F. Gaertn, also classified under the synonyms Butyrospermum paradoxum or Butyrospermum parkii; family Sapotaceae) is indigenous to the savanna belt in sub-Saharan Africa. Many vernacular names are used for Vitellaria, which is a reflection of its extensive range of occurrence — nearly 5,000 km from Senegal (west) to Uganda (east) across the African continent. In francophone West Africa, it is commonly known as karité, from which the name "shea butter" derives.

Shea butter, or shea nut butter, is a slightly yellowish or ivory-colored natural fat extracted from the fruit of the shea tree by crushing and boiling. The shea or karite tree, formerly Butyrospermum paradoxum, is now called Vitellaria paradoxa. It produces its first fruit (which resemble large plums) when it is about 20 years old and reaches its full production when the tree is about 45 years old; it produces nuts for up to 200 years after reaching maturity.

1.2 Grades and Common Forms

The United States Agency for International Development and other bodies have suggested a classification system for shea butter separating it into five grades. Commercial grades are A, B, and C. The color of raw (grade A) butter ranges from cream (like whipped butter) to grayish yellow.

Shea butter is commercially available in several distinct forms:

• Unrefined (raw) shea butter: Produced by traditional or semi-mechanical extraction, retaining its full complement of unsaponifiable bioactive compounds, characteristic smoky or nutty odor, and ivory-to-grayish color.
• Refined, bleached, and deodorized (RBD) shea butter: Subjected to industrial processing that removes color, odor, and — critically — many bioactive constituents.
• Shea butter extract / shea butter fractions: Concentrated preparations of specific components, such as the unsaponifiable fraction rich in triterpenes, used in pharmaceutical and cosmetic formulations.

Shea butter is also edible and is used as a cooking oil in West Africa, as well as sometimes being used in the chocolate industry as a substitute for cocoa butter. In some African countries such as Benin, shea butter is used as cooking oil, as a waterproofing wax, for hairdressing, for candle-making, and as an ingredient in medicinal ointments.

2. Traditional and Historical Use

2.1 Archaeological Record

University of Oregon anthropologists have pushed back the history of harvesting shea trees in West Africa by more than 1,000 years earlier than previously believed. Evidence for earlier use of the wild trees dating to A.D. 100 — reported in the Journal of Ethnobiology — surfaced from excavations at the well-preserved archaeological site at Kirikongo in western Burkina Faso. Previous published reports of regular use of shea trees had pointed to about A.D. 1100.

Gas chromatography-mass spectrometry of the hair of ancient Egyptian mummies from 2,600–3,500 years ago also revealed the use of a stearic acid-rich material which may have been shea butter. The rich history of shea butter production and use spans centuries from the time of Queen Cleopatra's reign (51–30 B.C.), when it was stored in clay jars and transported using caravans.

2.2 Traditional Uses in Sub-Saharan Africa

Shea butter, a fat produced from the kernels of the shea tree, has historically been used as an indigenous therapy for dermatologic ailments in Sub-Saharan Africa (SSA). A 2022 peer-reviewed literature review published in Dermatologic Therapy (Ugwu-Dike & Nambudiri, PMID 33480103) conducted a systematic examination of all available publications on the use of shea butter to treat dermatoses within SSA, finding 24 dermatologic uses across 30 references. Eight SSA countries were represented. The most frequently investigated conditions were scabies, wound healing, and umbilical cord care. Shea butter was most commonly used in combination with other ingredients to produce a medical treatment, with the most frequent adjuvant being Elaeis guineensis (African oil palm).

Shea butter is used by local healers as a treatment for rheumatism, inflammation of the nostrils, nasal congestion, leprosy, cough, and minor bone dislocation. Shea butter has also been used for soothing and accelerating healing after circumcision, and for preventing stretch marks in African pregnant women.

In some African countries such as Benin, shea butter is used for hairdressing and as an ingredient in medicinal ointments. It is used by makers of traditional African percussion instruments to increase the durability of wood (such as carved djembe shells), dried calabash gourds, and leather tuning straps.

2.3 Traditional Extraction Methods

Fat extraction is mainly done by traditional methods that involve roasting and pressing of the kernels, churning the obtained liquid with water, boiling, sieving, and cooling. Shea butter is taken out of its nut using different methods, such as boiling, semi-mechanical, mechanical, and solvent extraction methods. Traditional production, primarily conducted by women in West African communities, is a labor-intensive multi-day or multi-week process.

The production and trade of shea butter has long been linked to women; it has earned the alias "women's gold" for being a source of income to an average of three million African women, as stated by the United Nations Development Programme.

3. Key Constituents and Active Compounds

3.1 Fatty Acid Composition

Shea butter is primarily a triglyceride fat. The two main fatty acids in shea butter are stearic and oleic acid. The fatty acid profile typically includes:

• Oleic acid (C18:1): A monounsaturated omega-9 fatty acid; the most abundant fatty acid in most samples, often comprising approximately 40–55% of total fatty acids.
• Stearic acid (C18:0): A long-chain saturated fatty acid, typically comprising approximately 35–45%.
• Linoleic acid (C18:2): A polyunsaturated essential fatty acid, typically 3–8%.
• Palmitic acid (C16:0): A saturated fatty acid, typically 3–7%.

Regional variation in triglyceride composition has been documented; Ugandan samples had major triglycerides as SOS (19.87%), SOO (33.39%), and OOO (19.07%), while the same triacylglycerides in samples from Mali, Burkina Faso, and Nigeria were 40%, 26%, and 10%, respectively.

3.2 Unsaponifiable (Non-Saponifiable) Fraction

Shea butter is popular in skin care and cosmetic product formulations in part due to the unusually high level (5–15%) of nonsaponifiable lipid (NSL) constituents in the fat, which is a potentially rich source of vitamin E (a natural antioxidant). For comparison, a typical vegetable oil contains less than 1% unsaponifiables.

The unsaponifiable fraction contains several classes of bioactive compounds:

Triterpene Alcohols and Their Esters

The primary triterpene components isolated from the kernel fat (n-hexane extract) of the shea tree include four triterpene acetates — alpha-amyrin acetate, beta-amyrin acetate, lupeol acetate, and butyrospermol acetate — and four triterpene cinnamates — alpha-amyrin cinnamate, beta-amyrin cinnamate, lupeol cinnamate, and butyrospermol cinnamate. In shea butter, the major part of the unsaponifiable matter is alpha- and beta-amyrin, butyrospermol, and lupeol, present in the form of cinnamic and acetic acid esters and, to a lesser extent, as fatty acid esters and free alcohols.

West African shea butters from Nigeria (12.6%), Mali (9.6%), and Burkina Faso (7.1%) have been found to contain more triterpene alcohols than East African butters.

Tocopherols (Vitamin E)

About two-thirds of the vitamin E found in shea butter occurs in the form of alpha-tocopherol, a component that has the highest antioxidant activity among the tocopherols in most cases; followed by δ (15%), γ (14%), and β (7%) tocopherols.

Phytosterols

Shea butter NSL also contains relatively high total levels (up to 6%) of phytosterols (generally regarded as cholesterol-reducing nutritional factors): campesterol, stigmasterol, alpha-sitosterol, and alpha-spinosterol, and triterpene alcohols in the form of 4,4'-dimethylsterols including cinnamic acid esters.

Phenolic Compounds

Analysis of the phenolic constituents of shea kernels has demonstrated the presence of quercetin, trans-cinnamic acid, and eight catechins — gallic acid, catechin, epicatechin, epicatechin gallate, gallocatechin, epigallocatechin, gallocatechin gallate, and epigallocatechin gallate — many of which are also found in green tea. The concentration of these catechins in V. paradoxa varies by region in Africa. Gallic acid is considered the primary phenolic constituent, ranging from 27% to 70% of the total phenols identified in various areas of Africa.

3.3 Effect of Processing on Constituent Composition

The fatty acid profile of shea butter remains relatively stable through processing, but the unsaponifiable fraction — the portion containing triterpenes, tocopherols, and other bioactive compounds — does not. Refined shea butter loses significant amounts of these beneficial compounds. Refined shea stearin shows lower peroxide value, free fatty acids, unsaponifiable matter, total phenolic content, total flavonoid content, radical scavenging activity, tocopherol, and sterol content than crude shea butter.

4. Established Mechanisms of Action

4.1 Anti-Inflammatory Mechanisms

The anti-inflammatory properties of shea butter are attributed primarily to its triterpene esters. The key peer-reviewed study establishing this mechanism was published by Akihisa et al. (2010) in the Journal of Oleo Science (PMID: 20484832):

Upon evaluation of eight triterpene esters for inhibitory activity against 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced inflammation (1 µg/ear) in mice, all of the compounds tested exhibited marked anti-inflammatory activity, with ID₅₀ values in the range of 0.15–0.75 µmol/ear. Lupeol cinnamate (10 mg/kg) further exhibited anti-inflammatory activity on rat hind paw edema induced by carrageenan, with the percentage of inflammation at 1, 3, and 5 hours of 35.4%, 41.5%, and 45.5%, respectively.

Lupeol cinnamate displayed the greatest anti-inflammatory activity, on carrageenan-induced edema on rat hind paws. All eight substances also exhibited moderate inhibitory effects on Epstein-Barr virus early antigen (EBV-EA) in Raji cells as a primary screening test for tumor promoter inhibitors.

At the molecular level, research cited in published reviews indicates that the triterpene alcohol lupeol has been shown to inhibit the NF-κB signaling pathway, a key trigger for inflammation in conditions like eczema, thereby helping reduce the expression of pro-inflammatory enzymes such as inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2).

4.2 Emollient and Skin-Barrier Mechanisms

The components of shea butter directly address the three core issues associated with eczematous skin: barrier dysfunction, dryness, and inflammation. The high lipid content acts as a "refatting" agent, helping restore lost lipids in the outermost layer of the skin (the stratum corneum), which strengthens the skin's defense mechanism.

4.3 Antioxidant Mechanisms

Shea butter's biochemical properties indicate some antioxidant and anti-inflammatory activities. The tocopherol (vitamin E) fraction is the primary contributor to antioxidant activity. About two-thirds of the vitamin E found in shea butter occurs in the form of alpha-tocopherol, which has the highest antioxidant activity among the tocopherols.

4.4 UV-Absorbing Mechanisms

Shea butter contains cinnamic acid esters, compounds that absorb UV radiation in a manner similar to the chemical UV filter cinnamate. Research suggests raw shea butter provides a natural SPF of approximately 3 to 6. The esters contained in shea butter absorb some UVB rays; however, shea butter alone does not constitute a sunscreen, but when used in conjunction with a sunscreen, it can help boost the SPF index.

5. Scientific Evidence by Area of Use

5.1 Skin Moisturization and Barrier Function

The strongest and most consistent body of evidence for shea butter relates to its emollient and skin-hydrating properties. The mechanism is well-characterized: shea butter functions as an emollient, meaning that rather than directly adding moisture to the skin, it creates a protective barrier on the outermost skin surface, locking in moisture and preventing water loss.

Evidence strength: Moderate (supported by mechanism studies and several clinical studies, though some are small-scale or involve shea butter as part of multi-ingredient formulations).

5.2 Atopic Dermatitis (Eczema)

A prospective clinical trial (Hong Kong, 2015; PMID 26314567) enrolled consecutive paediatric patients with atopic dermatitis at a university teaching hospital in Hong Kong between April 2013 and March 2014. Disease severity (SCORAD index), skin hydration, and transepidermal water loss were obtained prior to and following 4-week usage of a cream/cleanser containing lipid complex with shea butter extract. A total of 34 patients with atopic dermatitis were recruited; 74% reported "very good" or "good" general acceptability of the shea butter–containing cream. The cream containing shea butter extract did not differ in acceptability or efficacy from a ceramide-precursor product.

A Thai randomized controlled trial evaluated a shea butter–ceramide combination against 1% hydrocortisone cream in childhood atopic dermatitis. Twenty-six children aged 2 to 18 years with mild to moderate atopic dermatitis were enrolled. There were no statistically significant differences between groups on primary outcome measures (SCORAD and POEM), suggesting the shea butter–ceramide formulation was comparable in effectiveness to low-potency topical corticosteroid.

A 2025 double-blind randomized trial (PMC11685320) assessed moisturizers containing multiple anti-inflammatory ingredients including shea butter in mild-to-moderate atopic dermatitis patients. This double-blind, randomized trial involved 32 patients with mild to moderate atopic dermatitis, aged 18–64 years. The severity of the disease using SCORAD showed a significant difference (p < 0.05) between the experiment group and the control group after 2 weeks of intervention. However, as shea butter was one of several active ingredients in the formulation, its individual contribution cannot be isolated from this study.

There is a general lack of published clinical trials to document the efficacy and skin biophysiological effects of many proprietary moisturisers containing shea butter as a sole active. Evidence strength: Preliminary to moderate. Existing randomized controlled trials are small, short-term, and frequently test shea butter as part of a multi-ingredient formulation rather than as a stand-alone therapy. Larger, better-controlled trials are needed.

5.3 Nasal Congestion / Rhinitis

Nasal decongestant use is one of the longest-documented traditional applications of shea butter in Nigeria and other parts of West Africa. An early human study (Tella, published in PubMed, PMID 89854) investigated this application: the seed of Butyrospermum parkii yields shea butter which, according to local traditional healers, relieves inflammation of the nostrils. Since there was no absolutely satisfactory nasal decongestant in clinical use, investigators evaluated the effects of shea butter in nasal congestion. The subjects were those suffering from rhinitis with moderate to severe nasal congestion. They were divided into a test group receiving shea butter, a control group treated with xylometazoline, and a placebo group receiving white petroleum jelly B.P. The results showed that nasal congestion was relieved more satisfactorily in the test group than in the other two groups. It was concluded that shea butter may prove more efficacious in nasal congestion than conventional nasal drops.

A more recent hospital-based study (Clinmed Journals, 2023) recruited 42 patients whose nasal congestion was confirmed by a consultant ENT surgeon; participants were all Nigerians — males and females — with ages ranging from 20 to 50 years. The study was confined primarily to symptomatic relief of inflammatory nasal congestion, excluding sinusitis. All subjects presented with moderate to severe or complete nasal blockade.

Evidence strength: Weak to preliminary. Both studies have methodological limitations including small sample sizes, limited blinding, and absence of validated objective nasal airflow measurement in one study. No large, adequately powered, double-blind RCTs have been published.

5.4 Wound Healing and Burns

In traditional medicine, shea butter has been employed in the treatment of several ailments. It supports wound healing and decreases skin irritation, and is also used as an anti-inflammatory agent for rashes in children, dermatitis, chapping, and ulcers.

A PMC-indexed experimental study (PMC7830171) examined shea butter's burn-healing effects in an animal model. An animal experiment on burn healing was carried out on nine male Sprague Dawley rats aged 6–8 weeks. After shaving the dorsum hair, a metal cube heated to 100°C for 20 seconds was used to create a deep second-degree burn wound. Medication with shea butter samples was initiated daily, with a thin film applied to burned areas. On days 1, 3, and 7, rats were anaesthetized and burned scar tissue was evaluated using pathological parameters.

Evidence strength: Very weak (preclinical/animal only). No rigorous human clinical trials examining shea butter as a standalone wound or burn treatment have been identified in the peer-reviewed literature.

5.5 Photoprotection

Shea butter contains cinnamic acid esters that absorb UV radiation. Research suggests raw shea butter provides a natural SPF of approximately 3 to 6. A 2020 study found that adding shea butter at 15% concentration to a sunscreen formulation increased SPF by approximately 35%. Shea butter is not a sunscreen replacement (SPF 3 to 6 is far below the recommended SPF 30), but it may provide supplemental UV filtering alongside proper sun protection.

Evidence strength: Limited. The SPF-boosting effect has been demonstrated in a formulation study, but shea butter alone provides insufficient UV protection for use as a primary sunscreen.

5.6 Stretch Marks (Striae Distensae)

Shea butter is widely used traditionally and commercially for the prevention and reduction of stretch marks, particularly during pregnancy. The theoretical basis is plausible — its emollient properties maintain skin hydration and elasticity — but direct clinical evidence is limited. A published pharmacy-school literature review (Pharmacophore Journal) addressed herbal treatments for striae, noting that while results may vary, anecdotal evidence exists for the potential effectiveness of shea butter in improving stretch mark appearance. Dermatologists have noted that moisturizing ingredients like shea butter and cocoa butter can soften and nourish skin affected by atrophic scars such as stretch marks.

Evidence strength: Weak. No large-scale, placebo-controlled RCT of shea butter specifically for striae has been identified. Evidence remains largely anecdotal and mechanistic.

5.7 Anti-Tumor-Promoting / Chemopreventive Activity

Using 7,12-dimethylbenz[a]anthracene (DMBA) as an initiator and TPA as a promoter in a two-stage carcinogenesis model in mice, investigators found that lupeol cinnamate inhibited skin tumor promotion. The biological activities of triterpene acetate and cinnamate esters, together with the exceptionally high levels of these triterpenes in shea fat, indicate that shea nuts and shea fat constitute a significant source of anti-inflammatory and anti-tumor promoting compounds.

Evidence strength: Preclinical only (in vitro and animal models). No human clinical trials have examined shea butter for cancer prevention. This area should not be extrapolated to clinical use without further research.

6. Body Systems and Health Areas Associated with Shea Butter

• Integumentary system (skin and hair): Skin moisturization, barrier repair, atopic dermatitis management, wound care, burn treatment, stretch mark prevention, minor UV protection. The fat (butter) is used in food preparation and medicinal and cosmetics industries.
• Respiratory system: Traditional and preliminary clinical use for nasal congestion and rhinitis, administered intranasally.
• Musculoskeletal system: Traditional use for rheumatism, arthritis, and joint pain in West African ethnomedicine, including treatment for rheumatism and minor bone dislocation by local healers.
• Cardiovascular and metabolic systems: The phytosterol fraction has theoretical cholesterol-modulating relevance, but based on human study, shea butter may be considered for lowering cholesterol levels; however, evidence remains limited and does not yet meet the standards for a confident clinical recommendation.
• Immune and inflammatory systems: In vitro and animal data support anti-inflammatory activity via multiple mechanisms including NF-κB, COX, and LOX inhibition by triterpene constituents.

7. Dosage Forms and Reported Study Dosages

Shea butter has been studied and used in several forms. The following dosages and forms are reported specifically in the studies identified above:

• Topical emollient cream (atopic dermatitis): A cream/cleanser containing lipid complex with shea butter extract (Ezerra cream) was applied over a 4-week period in a paediatric clinical trial; specific concentration of shea butter in the formulation was not reported in the abstract.
• Topical cream, twice daily for 8 weeks (atopic dermatitis, RCT): A Thai randomized controlled trial evaluated an emollient containing shea butter and ceramides compared to 1% hydrocortisone in children aged 2 to 18 years (n = 26) with mild-to-moderate atopic dermatitis. The shea butter and ceramides cream did not lead to any adverse effects after 8 weeks of twice-daily application.
• Nasal application (rhinitis): In the Tella study (PMID 89854), the substance was prepared in the laboratory and applied to human subjects suffering from rhinitis with moderate to severe nasal congestion. The exact preparation form (e.g., concentration, vehicle) was not publicly detailed beyond the abstract.
• Topical burn treatment (animal study): Medication with shea butter samples was initiated daily by the application of a thin film of the shea butter samples on the burned areas.
• Anti-inflammatory testing (in vivo): Lupeol cinnamate was tested at 10 mg/kg in rats for anti-inflammatory activity on carrageenan-induced hind paw edema.
• Sunscreen formulation study: Adding shea butter at 15% concentration to a sunscreen formulation increased SPF by approximately 35%.

No established standardized therapeutic dosage for oral consumption has been identified in the peer-reviewed literature included in this review.

8. Safety Considerations

8.1 General Tolerability

Shea butter is generally regarded as well-tolerated for topical use in most adults. A shea butter and ceramides cream did not lead to any adverse effects after 8 weeks of twice-daily application in children with atopic dermatitis. However, pediatric safety data are limited to a single short-term trial in children with atopic dermatitis, with no supporting evidence for children under 2 years of age or for long-term use in healthy children. No study has evaluated its safety during pregnancy and breastfeeding, leaving the question of safety in these populations unanswered; nonetheless, shea butter is considered a safe cosmetic ingredient for these sensitive populations by expert committees.

8.2 Allergic Contact Dermatitis

Studies have shown that shea butter is not a significant allergen and has a low potential for causing allergic reactions. A study conducted by the American Academy of Dermatology found that shea butter was not a common cause of allergic contact dermatitis. However, as with any cosmetic ingredient, some individuals may experience skin reactions to shea butter. These isolated reactions may manifest as mild redness, itching, swelling, or hives.

8.3 Latex Cross-Reactivity

A documented safety concern relates to potential cross-reactivity in individuals with latex allergy. Because the shea tree can contain natural latex, it may trigger a reaction in people with a latex allergy. Anyone with an allergy to latex is at risk of having an allergic reaction when using shea butter. However, recent research suggests shea butter does not contain proteins that bind with IgE, suggesting that shea butter nut allergy is unlikely in most individuals. Another study found that certain natural compounds in shea butter, such as butyrospermol and lupeol, were found to suppress hypersensitivity reactions mediated by IgE in mammals effectively, suggesting that shea butter might have a positive impact on managing allergies.

The risk appears concentrated in individuals with established Type I (IgE-mediated) latex allergy. Most shea butter products contain refined, bleached, and deodorized shea butter from which protein has been removed in the refining process, making it essentially allergen-free. It is raw and unrefined shea butter that may still contain protein, albeit a very insignificant amount.

8.4 Tree Nut Allergy Considerations

Shea butter is derived from the shea nut, so if a person has a tree nut allergy, shea butter may trigger a reaction. Even though the amount of protein in shea butter is quite small, it can provoke a reaction in someone who is very sensitive. However, the protein content of shea butter is notably low, and evidence for clinically meaningful reactivity in tree-nut-allergic individuals who are not also latex-sensitive is limited.

8.5 Comedogenicity

Shea butter's rich, emollient texture may feel overly occlusive for certain skin types, notably oily or blemish-prone skin. Most websites state that shea butter has a low comedogenic rating, but the origin of this assertion is unclear, as there are no studies to support it.

8.6 Drug Interactions

No peer-reviewed studies documenting pharmacokinetic drug–drug or drug–supplement interactions with topically or orally administered shea butter were identified in the sources reviewed. Given its predominantly topical use and lipid-based composition, clinically meaningful systemic drug interactions are not currently documented in the literature.

8.7 Quality and Purity Variability

Large variations are observed in the reported values for the composition of shea products. The quality of extracted shea butter has been shown to depend on where it came from, how it was treated before extraction, and how it was extracted. This compositional variability has direct implications for the consistency and reliability of any pharmacological or cosmetic effect.

References

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• Ugwu-Dike P, Nambudiri VE. A review of ethnomedicinal uses of shea butter for dermatoses in Sub-Saharan Africa. Dermatol Ther. 2022;35(3):e14786. PMID 33480103.
• Akihisa T, et al. Anti-inflammatory and chemopreventive effects of triterpene cinnamates and acetates from shea fat. J Oleo Sci. 2010;59(6):273–280. PMID 20484832.
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• Comparative Efficacy Between Shea Butter-Ceramide Cream and 1% Hydrocortisone Cream in Childhood Atopic Dermatitis. J Med Assoc Thai. 2021;104:1172–1178.
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