Science
Mechanism of Action
As a polymer siloxane, Polysilicone-4 is composed of silicon atoms interconnected by oxygen bridges. Its primary mechanism in skincare is to act as a surface modifier, notably by encapsulating metal oxides. This process aims to improve ingredient dispersion and potentially mitigate reactivity or alter sensory characteristics. It also functions as a hair conditioning agent.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded in December 2015 that Polysilicone-4 is safe for use in cosmetics specifically when utilized as a surface modifier to encapsulate metal oxides. However, data was considered insufficient to determine its safety for independent use in other functions such as antifoaming or viscosity modification. Systemic exposure is deemed unlikely when used as coated particles due to their substantial size. There is a noted absence of repeated dose toxicity, reproductive and developmental toxicity, genotoxicity, and carcinogenicity studies. No specific regulatory status from SCCS or FDA has been identified.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polysilicone-4 is an optional ingredient deemed safe by the CIR when acting as a surface modifier for metal oxides in cosmetics, although further safety data is insufficient for its independent use in other applications.
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References
Sources