ACETYL TETRAPEPTIDE-3 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

ACETYL TETRAPEPTIDE-3

Safety grade: A

This is a lab-created peptide (a small chain of amino acids) that is designed to help protect and strengthen the skin. It works by supporting the skin's natural barrier and helping it resist environmental stressors.

This ingredient is used to protect and fortify the skin barrier, helping it defend against environmental damage and maintain its natural resilience.

Graded using: COSING.

Last verified: May 26, 2026