R-(METHIONYL SH-POLYPEPTIDE-1 DECAPEPTIDE-40) is graded A (Safe) by Expert·ING, based on COSING regulatory data.

R-(METHIONYL SH-POLYPEPTIDE-1 DECAPEPTIDE-40)

Safety grade: A

This ingredient is a protein fragment derived from methionine, an amino acid found naturally in many foods. In skincare products, it works to help support and maintain healthy skin structure by promoting natural renewal processes. It's used in anti-aging and restorative formulas to help improve skin firmness and appearance.

Graded using: COSING.

Last verified: June 9, 2026