POLYQUATERNIUM-58 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

POLYQUATERNIUM-58

Safety grade: A

This is a specially engineered polymer (chain of molecules) designed to coat and protect hair strands. It's a positively charged ingredient that sticks to hair to make it smoother and easier to manage.

This ingredient conditions hair by coating the hair shaft to reduce frizz, add shine, improve softness, and enhance manageability.

Graded using: COSING.

Last verified: May 26, 2026