Science
Mechanism of Action
This ingredient functions by forming stable emulsions, effectively blending immiscible oil and water components within a formulation. As a thickener and viscosity controller, it modifies the product's consistency. Its parent, 12-Hydroxystearic Acid, contributes emollient effects, promoting a smoother skin feel and aiding in the uniform spread of the product.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Sodium Hydroxystearate is synthesized by neutralizing 12-hydroxystearic acid with sodium hydroxide, resulting in a stable anionic fatty acid salt. This compound exhibits good stability under typical conditions and maintains an alkaline pH within an aqueous environment, typically between 9 and 11.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed fatty acids and their salts, including Sodium Hydroxystearate, safe for use when properly formulated to be non-irritating and non-sensitizing. A maximum concentration of 20% is identified. For related ingredients such as Sodium Stearate, concentrations above this range have been noted for potential drying or pore-clogging effects. Precise formulation is critical to ensure optimal safety and minimize potential adverse reactions.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sodium Hydroxystearate is a valuable ingredient for enhancing formulation stability and texture, provided it is precisely formulated within its specified safety parameters.
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References
Sources