HAIR KERATIN AMINO ACIDS is graded A (Safe) by Expert·ING, based on COSING regulatory data.

HAIR KERATIN AMINO ACIDS

Safety grade: A

This ingredient comes from keratin, a natural protein found in hair, and breaks it down into amino acids—the building blocks that strengthen hair. When used in shampoos and conditioners, these amino acids help repair damaged hair, improve texture, and add shine by filling in gaps along the hair shaft.

Graded using: COSING.

Last verified: June 9, 2026