SILICONE QUATERNIUM-4 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

SILICONE QUATERNIUM-4

Safety grade: A

This is a silicone-based conditioning agent that helps reduce static electricity and frizz in hair. It's a type of modified silicone that carries a positive charge, allowing it to coat and smooth the hair surface.

It conditions hair by creating a smooth protective layer, reducing frizz and static electricity while improving hair manageability and shine.

Graded using: COSING.

Last verified: May 26, 2026