DIPEPTIDE-9 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

DIPEPTIDE-9

Safety grade: A

Dipeptide-9 is a small chain of amino acids (the building blocks of proteins) created in a laboratory. It works to attract and retain moisture in hair and skin while providing conditioning benefits.

This ingredient hydrates and conditions hair and skin by attracting moisture and helping products maintain their effectiveness longer.

Graded using: COSING.

Last verified: May 26, 2026