PENTAPEPTIDE-30 CYSTEINAMIDE is graded A (Safe) by Expert·ING, based on COSING regulatory data.

PENTAPEPTIDE-30 CYSTEINAMIDE

Safety grade: A

This is a small chain of amino acids (the building blocks of protein) that is designed to strengthen and protect hair. It works by coating the hair shaft to help retain moisture and improve texture.

This ingredient conditions hair by creating a protective layer that smooths the hair cuticle, reduces frizz, and helps lock in moisture for softer, more manageable hair.

Graded using: COSING.

Last verified: May 26, 2026