SR-CAT POLYPEPTIDE-4 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

SR-CAT POLYPEPTIDE-4

Safety grade: A

This protein-based ingredient is designed to help strengthen and protect your skin's natural barrier. It works by supporting the skin's structure and may help improve firmness and resilience. You'll typically find it in anti-aging and skin-conditioning products.

Graded using: COSING.

Last verified: June 9, 2026