Is Polyquaternium-4 Safe?
Polyquaternium-4 is a stabilizer that maintains product consistency, texture, and performance over time.
Polyquaternium-4 Safety Overview
Stabilizers are generally inert and very safe.
How Polyquaternium-4 Is Used
Used for preventing separation, degradation, or texture changes in sunscreens, foundations, emulsions, and suspension-based products. Safe at approved concentrations in liquid foundations, sunscreen lotions, anti-aging serums, and emulsion creams.
Who Should Be Cautious?
Generally safe for emulsions, suspensions, and multi-phase formulations. Patch test if you have sensitive skin.