QUATERNIUM-27 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

QUATERNIUM-27

Safety grade: A

Quaternium-27 is a man-made conditioning agent that helps reduce frizz and static electricity in hair. It works by coating the hair shaft to make it smoother and easier to manage.

This ingredient is used in hair care products to eliminate static buildup, reduce frizz, and provide conditioning benefits that make hair softer and more manageable.

Graded using: COSING.

Last verified: May 26, 2026