PENTAPEPTIDE-51 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

PENTAPEPTIDE-51

Safety grade: A

A lab-made protein fragment designed to help skin look firmer and smoother by working with your skin's natural support system. It's commonly used in anti-aging serums and creams to reduce the appearance of fine lines and improve skin elasticity over time.

Graded using: COSING.

Last verified: June 9, 2026