Science
Mechanism of Action
This ingredient functions as an emollient by effectively filling the microscopic intercellular spaces between dead skin cells on the skin's surface, which visually and tactilely softens and smoothes the skin. It concurrently establishes a thin, hydrophobic film that acts as a physical barrier. This protective layer is instrumental in reducing trans-epidermal water loss, safeguarding the skin's lipid barrier integrity, and providing defense against various environmental irritants.
Research
Clinical Evidence
High confidence4-12%
Key findings
- 01 Clinical observations indicate that concentrations between 4% and 12% in cosmetic formulations deliver significant benefits, including superior lubricity, enhanced gloss, and excellent hydrophobicity. This range also demonstrates pronounced film-forming capabilities and effective moisture retention, making it particularly beneficial for skin and hair care. It is effective even at low concentrations.
- 02 As a conditioning agent, Stearyl Trimethicone, along with other dimethicone and methicone polymers, is typically utilized in cosmetic formulations at concentrations up to 15%.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Stearyl Trimethicone is an oil-soluble silicone wax known for its stability across a broad pH range; similar silicone compounds demonstrate integrity from pH 3 to 10. For optimal incorporation, it should be heated and melted with other oil-phase components to ensure homogeneous mixing. It is suitable for both anhydrous cosmetic oil systems and the oil phase of emulsion formulations. Optimal storage is recommended below 25°C (77°F) to maintain stability.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that Stearyl Trimethicone and related dimethicone/methicone polymers are safe for use in cosmetic formulations, provided they are formulated to be non-irritating. Its substantial molecular weight renders significant skin absorption unlikely. It has been reported to the FDA as an ingredient in cosmetic products. The Scientific Committee on Consumer Safety (SCCS) generally evaluates cosmetic ingredient safety but has not issued a specific opinion on Stearyl Trimethicone individually.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Stearyl Trimethicone is a valuable silicone-based emollient and skin conditioner, widely compatible and safe for all skin types, effectively enhancing skin texture and barrier function.
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