Science
Mechanism of Action
This crosspolymer forms a protective film on the skin's surface, which helps condition the skin and potentially retain moisture. Its substantial molecular size is a key factor in its mechanism, preventing percutaneous absorption and ensuring its activity is localized. Additionally, it serves as an absorbent and can modify the viscosity and opacity of cosmetic formulations.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that Styrene Methyltrimonium Chloride Crosspolymer, along with other styrene and vinyl-type styrene copolymers, is safe for use in cosmetic products under current practices. Due to its large molecular size, percutaneous absorption is not anticipated. Although styrene monomer is classified as carcinogenic, the Panel noted that any detectable residual levels in cosmetic products would be well below concerning levels. It is important to differentiate this ingredient from 'Styrene/Acrylates copolymer (nano)', a distinct nano-sized material for which the SCCS could not establish safety due to insufficient data.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Styrene Methyltrimonium Chloride Crosspolymer is a valuable multifunctional ingredient, confirmed safe for cosmetic use, offering skin conditioning, absorption, and rheological benefits without significant absorption risk.
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References
Sources