POLYQUATERNIUM-66 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

POLYQUATERNIUM-66

Safety grade: A

This is a specially engineered polymer that acts like a detangler and styling agent for hair. It helps hair stay in place while keeping it soft and manageable.

This ingredient conditions hair by reducing frizz and tangles while also helping hairstyles hold their shape longer without making hair feel stiff or sticky.

Graded using: COSING.

Last verified: May 26, 2026