SILICONE QUATERNIUM-1 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

SILICONE QUATERNIUM-1

Safety grade: A

This is a silicone-based ingredient that has been chemically modified to carry a positive electrical charge. It's designed to coat hair strands and reduce static electricity while making hair softer and smoother.

It eliminates frizz and static in hair while providing conditioning benefits that improve shine, smoothness, and manageability.

Graded using: COSING.

Last verified: May 26, 2026