ACETYL TETRAPEPTIDE-5 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

ACETYL TETRAPEPTIDE-5

Safety grade: A

This is a small chain of amino acids (the building blocks of proteins) that has been created in a laboratory. It works to help skin retain moisture and stay hydrated.

This ingredient acts as a humectant, meaning it draws moisture from the air and deeper skin layers to the surface, helping to keep skin hydrated and plump.

Graded using: COSING.

Last verified: May 26, 2026