POLYQUATERNIUM-42 is graded A (Safe) by Expert·ING, based on COSING, FDA regulatory data.

POLYQUATERNIUM-42

Safety grade: A

This is a lab-created preservative that helps prevent the growth of bacteria and other microorganisms in cosmetic products. It works by disrupting the protective barriers of microbes, keeping your product fresh and safe to use.

This antimicrobial ingredient protects cosmetic products from bacterial and microbial contamination, extending shelf life and maintaining product safety.

Graded using: COSING, FDA.

Last verified: May 26, 2026