METHIONYL SH-POLYPEPTIDE-101 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

METHIONYL SH-POLYPEPTIDE-101

Safety grade: A

This protein-based ingredient is designed to help strengthen and protect your skin's natural barrier. Derived from amino acids, it works to improve skin firmness and elasticity while supporting the skin's structural integrity. It's commonly found in anti-aging and firming skincare products.

Graded using: COSING.

Last verified: June 9, 2026