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Hair Conditioning

HYDROLYZED HAIR KERATIN

CAS 65997-21-9 / 69430-36-0 Updated
72

Safety score · 0–100

Fine

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

About

Keratin protein from hair, broken down into smaller peptides for conditioning and film-forming use. Effective and generally safe, but origin, processing residues and vegan/ethical sourcing are practical caveats.

Skin benefits

  • Substantive conditioning for hair
  • Film-forming repair claim on damaged hair
  • Small peptide fraction with skin-conditioning effect
  • Source of amino acids for cuticle smoothness

Known concerns

  • Animal-derived (human/animal hair) — source traceability essential
  • Possible carrier of formaldehyde or sulphide residues from processing
  • Allergen potential for sensitised individuals
  • Not vegan

References

EU

EU CosIng database

European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.