Science
Mechanism of Action
As an emollient, Tristearin forms a protective film on the skin's surface, which helps to minimize transepidermal water loss and lock in hydration. This action contributes to a smoother, more supple skin texture. Additionally, as a glyceryl triester, it has been demonstrated to increase the permeability of the stratum corneum, potentially facilitating the absorption of other ingredients.
Research
Clinical Evidence
Medium confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Tristearin is heat tolerant and stable within a pH range of 3.5 to 9.0. However, it can crystallize into various polymorphic forms (alpha, beta', beta) with melting points between 54 °C and 72.5 °C, which may influence product aesthetics and stability. Liquid emulsifiers can potentially enhance the alpha-beta polymorphic transformation due to structural and molecular mobility factors.
Synergies
- Enhances skin penetration of other cosmetic ingredients, potentially improving their delivery.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed Tristearin safe for use in cosmetic applications, with documented concentrations up to 1.68%. While generally well-tolerated, its capacity to enhance the penetration of other chemicals necessitates careful formulation. Transient, mild to moderate ocular irritation has been observed at 0.32% in commercial products. The FDA has approved Tristearin for direct and indirect food additive uses.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Tristearin is a valuable emollient and textural enhancer, especially beneficial for dry and sensitive skin due to its low irritation profile, though its permeation-enhancing properties require precise formulation considerations.
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