TETRAPEPTIDE-13 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

TETRAPEPTIDE-13

Safety grade: A

Tetrapeptide-13 is a small protein fragment made up of four amino acids linked together. It's designed to help improve skin texture and appearance by supporting the skin's natural structure.

This ingredient conditions and improves skin by helping to enhance skin firmness, elasticity, and overall smoothness through its interaction with skin proteins.

Graded using: COSING.

Last verified: May 26, 2026