ISOOCTANOYL TETRAPEPTIDE-25 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

ISOOCTANOYL TETRAPEPTIDE-25

Safety grade: A

This is a synthetic peptide, which is a tiny chain of amino acids (the building blocks of proteins) that has been modified with a fatty acid to help it absorb into the skin. Think of it as a small signaling molecule that communicates with skin cells to support healthy skin function.

This ingredient is used in cosmetic products to condition and improve the overall feel and appearance of skin, helping to keep it soft, smooth, and well-nourished.

Graded using: COSING.

Last verified: May 26, 2026