Shea fat: properties, uses, pros, cons, safety

Definition

Shea fat (often marketed as the olein fraction or “shea oil”) is the liquid fraction obtained by fractionation of shea butter derived from the seeds of Vitellaria paradoxa (family Sapotaceae). Compared with whole shea butter, it typically feels lighter, has a relatively higher share of oleic acid, a lower melting range, and is generally liquid at room temperature (with possible clouding or partial solidification at lower temperatures). It is used mainly as an emollient in cosmetics where improved slip, faster absorption and a less “buttery” sensory profile are desired.

Production process

The starting material is shea butter obtained by traditional or industrial extraction from the seeds. A fractionation step (typically dry fractionation or equivalent processes) then separates a more solid fraction (stearin) from a more liquid fraction (olein). Depending on the specification, the olein may be further refined (filtration, deodorisation) to stabilise odour/colour and improve batch consistency. Key controls include peroxide value, acidity, moisture/impurities, fatty acid profile, and cold stability (cloud point/turbidity).

Key constituents

The matrix is mainly triglycerides. In the olein fraction, triglycerides richer in oleic acid are predominant, while the relative share of stearic acid is lower than in unfractionated shea butter. Palmitic and linoleic acids are also present in variable amounts. The unsaponifiable fraction is usually present at a variable level (depending on origin and refining) and may include tocopherols and other minor constituents that contribute to stability and cosmetic performance.

Practical note: like all lipids, it is sensitive to oxidation; barrier packaging and control of light/temperature are critical to prevent rancid notes and sensory drift.

Identification data and specifications

Physico-chemical properties (indicative)

Main uses

Cosmetics

Used as an emollient in body/face oils, serums, light lotions, creams, sunscreens and hair-care products when a more slip-rich and less waxy feel than shea butter is desired. It improves spreadability and can support comfort for dry-feeling skin in synergy with other lipids, without markedly increasing oil-phase viscosity.

INCI functions. Emollient; skin conditioning.

Industrial use

May be used as a lipid base in technical blends and soaps where a more fluid and process-friendly fraction than whole butter is needed, with more predictable pumping and dosing behaviour.

Health aspect

In cosmetics, the “health” aspect mainly concerns skin tolerability and suitability for dry/dehydrated skin, considering the full formula and individual sensitivity.

Pros
The more lightweight profile compared with butter can improve sensory acceptance, making it useful in leave-on products where emollience is needed with less “heavy” feel. It is versatile as a lipid phase component in fluid formulations and can support comfort and softness.

Cons
For some individuals it may still feel occlusive or be less well tolerated, especially in very lipid-rich formulas or on blemish-prone skin. Batch variability and refining level can affect odour, colour and stability, requiring tighter specifications and controls (notably for oxidation and cold turbidity).

Serving note
Not applicable in a nutritional sense for cosmetic use.

Safety (allergens, contraindications)

It is not considered a “typical” allergen, but individual sensitisation can occur. Practical contraindications mainly concern very reactive skin or a history of reactions to specific lipids: in such cases, it is preferable to select grades with high purity and stable odour (often refined) and evaluate compatibility of the full formula. Quality management should cover contaminants control, traceability and fitness-for-use for the intended cosmetic category.

Storage and shelf-life

Store in a cool, dry place, away from light and heat, tightly closed and with an oxygen barrier. Avoid frequent opening and contamination; minimise prolonged air exposure to reduce oxidation. Shelf-life depends on initial peroxide value, packaging and warehouse conditions.

Labelling

In cosmetics, the common INCI denomination for the liquid fraction is Butyrospermum Parkii Oil (exact naming and details depend on the supplier specification). Where applicable, fragrance allergens and other regulated declarations must be handled according to finished-product rules.

Functional role and rationale for use

Its primary role is as a fluid emollient: it increases slip, facilitates application and contributes to a softer skin feel. Compared with butter, it enables lighter textures (oils and serums) while maintaining “shea” positioning and broad compatibility with many oil-phase systems.

Formulation compatibility

It is compatible with a wide range of esters, vegetable oils and (where allowed) silicones, and integrates well into light O/W emulsions. Cold turbidity can be relevant in transparent products: it is managed through low-turbidity specifications, lipid-profile control and an appropriate thermal chain. In hair care, dosage should be tuned to limit build-up while maintaining lightness and combability.

Safety, regulatory and quality

Implementation of GMP/HACCP (good practices and supply-chain quality control) supports traceability, contaminants control and batch consistency. For cosmetic use, compliance depends on supplier specifications and the safety assessment of the finished product, with particular attention to oxidation parameters and sensory stability.

Conclusion

Shea fat (the olein fraction of Vitellaria paradoxa) is a lipid raw material designed to deliver emollience with a more lightweight sensory profile than shea butter. The main technical drivers are fatty acid profile, oxidation control, cold stability (turbidity) and specification consistency. In cosmetics, it is especially useful in oils and lotions where high slip and spreadability are required while maintaining a “shea” identity.

Studies

Shea fat is mainly made up of fatty acids (1).

• 28-56% Stearic acid
• 34-61% Oleic acid
• Gallic acid

The trees that provide a higher content of these fatty acids are those from West Africa rather than from East Africa.

It is used in traditional medicine for the treatment of various diseases, including inflammation and fever. This is an ethyl acetate capable of exerting an anti-inflammatory and anti-rheumatoid action (2).

Two derivatives, glucosylcucurbic acid and methyl glucosylcucurbate, were recently isolated from the shea kernel. These and their derivatives of cucurbic acid and cucurbate methyl, were evaluated for their melanogenesis-inhibiting cancer properties (3).

For more information:

Shea butter studies

References___________________________________________

(1) Akihisa T, Kojima N, Katoh N, Ichimura Y, Suzuki H, Fukatsu M, Maranz S, Masters ET. Triterpene alcohol and fatty acid composition of shea nuts from seven African countries. J Oleo Sci. 2010;59(7):351-60. doi: 10.5650/jos.59.351.

(2) Eyong KO, Foyet HS, Baïrys G, Ngosong Folefoc G, Acha Asongalem E, Lagojda A, Lamshöft M. A new ursane triterpenoic acid and other potential anti-inflammatory and anti-arthritic constituents from EtOAc extracts of Vitellaria paradoxa stem bark. J Ethnopharmacol. 2015 Nov 4;174:277-86. doi: 10.1016/j.jep.2015.08.014. 

(3) Zhang J, Kurita M, Ebina K, Ukiya M, Tokuda H, Yasukawa K, Masters ET, Shimizu N, Akihisa M, Feng F, Akihisa T. Melanogenesis-inhibitory activity and cancer chemopreventive effect of glucosylcucurbic acid from shea (Vitellaria paradoxa) kernels. Chem Biodivers. 2015 Apr;12(4):547-58. doi: 10.1002/cbdv.201400424.

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Zhang J, Kurita M, Shinozaki T, Ukiya M, Yasukawa K, Shimizu N, Tokuda H, Masters ET, Akihisa M, Akihisa T. Triterpene glycosides and other polar constituents of shea (Vitellaria paradoxa) kernels and their bioactivities. Phytochemistry. 2014 Dec;108:157-70. doi: 10.1016/j.phytochem.2014.09.017.