TETRAPEPTIDE-129 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

TETRAPEPTIDE-129

Safety grade: A

This lab-created peptide is a tiny protein fragment designed to help firm and smooth skin by supporting its natural structure. It works to reduce the appearance of fine lines and wrinkles, making skin look more lifted and youthful. It's commonly used in anti-aging serums and creams.

Graded using: COSING.

Last verified: June 9, 2026