POLYQUATERNIUM-55 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

POLYQUATERNIUM-55

Safety grade: A

This is a lightweight polymer that forms a thin, flexible film on hair. It helps hold hairstyles in place while keeping hair soft and manageable.

This ingredient is used in hair styling products to provide hold and control while maintaining hair flexibility and shine, preventing frizz and helping styles last longer.

Graded using: COSING.

Last verified: May 26, 2026