QUATERNIUM-33 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

QUATERNIUM-33

Safety grade: A

Quaternium-33 is a man-made conditioning agent that helps reduce frizz and static electricity in hair. It works by creating a smooth coating on hair strands that makes them easier to manage and style.

This ingredient reduces static buildup in hair and provides conditioning benefits that improve hair smoothness, shine, and manageability.

Graded using: COSING.

Last verified: May 26, 2026