POLYQUATERNIUM-31 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

POLYQUATERNIUM-31

Safety grade: A

This is a synthetic polymer that acts like a lightweight conditioning agent, similar to how fabric softener works on clothes. It helps reduce static electricity and creates a smooth, protective layer on hair.

This ingredient reduces frizz and static while creating a thin, flexible film on hair that improves smoothness and adds shine without weighing hair down.

Graded using: COSING.

Last verified: May 26, 2026