CARBOXYMETHYL DISULFIDE KERATIN is graded A (Safe) by Expert·ING, based on COSING regulatory data.

CARBOXYMETHYL DISULFIDE KERATIN

Keratin

Safety grade: A

Keratin is a protective protein naturally found in hair that strengthens and repairs damaged strands. This version is chemically modified to better penetrate and condition hair.

This ingredient coats and strengthens hair fibers, reducing frizz and breakage while improving shine and smoothness.

Graded using: COSING.

Last verified: May 26, 2026