Science
Mechanism of Action
This ingredient functions by creating a thin, impermeable hydrophobic film on the skin's surface. This film acts as an occlusive layer, physically preventing water molecules from escaping, thereby reducing transepidermal water loss. Simultaneously, this barrier shields the skin from external environmental aggressors and irritants. As an emollient, it effectively fills microscopic irregularities and crevices on the skin, resulting in a noticeably smoother and softer texture. Furthermore, it improves the spreadability of formulations, enhances skin luster, and promotes superior product adhesion.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Specific optimal pH for the stability of Stearoxymethicone/Dimethicone Copolymer is not explicitly defined in the available research. However, a functionally related silicone copolymer, PEG-8 Dimethicone, has demonstrated stability within a pH range of 5.5 to 8.5.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has affirmed Stearoxymethicone/Dimethicone Copolymer as safe for use in cosmetic formulations. Its large molecular weight suggests minimal to no significant dermal absorption. While no specific maximum concentration for this exact copolymer was detailed, related Dimethicone polymers are safely employed in dermal products at concentrations reaching up to 85%. The FDA permits Dimethicone, a related compound, as an OTC skin protectant.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Stearoxymethicone/Dimethicone Copolymer is a valuable ingredient, effectively forming a protective, occlusive, and emollient barrier for all skin types, with a strong safety profile.
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