METHIONYL SH-POLYPEPTIDE-1 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

METHIONYL SH-POLYPEPTIDE-1

Safety grade: A

This is a lab-created protein fragment designed to support your skin's natural structure and firmness. It works by helping to strengthen and condition the skin, making it appear smoother and more resilient. You'll typically find it in anti-aging and firming skincare products.

Graded using: COSING.

Last verified: June 9, 2026