POLYQUATERNIUM-18 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

POLYQUATERNIUM-18

Safety grade: A

A conditioning polymer that's commonly used in hair and skincare products to make them work better. It's a lab-created ingredient that helps products spread smoothly and reduces static electricity.

This ingredient reduces frizz and static while creating a protective coating on hair or skin, leaving it feeling smooth and conditioned.

Graded using: COSING.

Last verified: May 26, 2026