R-(METHIONYL SH-POLYPEPTIDE-31 DECAPEPTIDE-40) is graded A (Safe) by Expert·ING, based on COSING regulatory data.

R-(METHIONYL SH-POLYPEPTIDE-31 DECAPEPTIDE-40)

Safety grade: A

This ingredient is a blend of amino acids and protein fragments derived from plant sources. It works to help improve skin firmness and elasticity by supporting the skin's natural structure. It's commonly used in anti-aging skincare products to help reduce the appearance of fine lines.

Graded using: COSING.

Last verified: June 9, 2026