Science
Mechanism of Action
As a nonionic surfactant with an HLB value of 10.0, Polysorbate 81 functions by lowering the surface tension between immiscible substances. This mechanism facilitates the creation of stable oil-in-water emulsions, enabling the uniform distribution of ingredients that would typically separate. It also contributes to skin conditioning and overall formulation integrity.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polysorbate 81 is generally stable, but its integrity can be compromised through oxidation or hydrolysis when exposed to strong acid or strong alkali conditions.
Conflicts
- strong acids
- strong alkalis
- strong oxidants
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded Polysorbate 81 is safe for cosmetic use, provided it is formulated to be nonirritating. This assessment is consistent with European Cosmetics Regulation, where polysorbates are permitted. While other polysorbates have specific FDA approvals for food and ophthalmic uses, Polysorbate 81 is considered safe within the polysorbate family.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polysorbate 81 is a valuable multi-functional ingredient, expertly stabilizing formulations and delivering emollient benefits with a low risk of irritation across all skin types, with a reported maximum use concentration of 25.6% in cleansing products.
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