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hair-repair peptide

AMIDINOCYSTEINYL HYDROLYZED KERATIN

76

Safety score · 0–100

Fine

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

Amidinocysteinyl hydrolyzed keratin is a cationic keratin peptide that bonds to damaged hair fibers via cysteine groups, supporting strength and resilience in chemically processed hair.

Function

ASTRINGENT, FILM FORMING, HAIR CONDITIONING, HAIR WAVING OR STRAIGHTENING

Skin benefits

  • Cysteine-bearing keratin peptide can bind to damaged hair via disulfide bridges
  • Helps repair and strengthen porous, chemically treated hair
  • Protein source generally well tolerated in skin and hair care

Known concerns

  • Cross-reactivity risk in users sensitized to wool or hair proteins
  • Amidino modification adds cationic character that can irritate at high levels
  • Limited published cosmetic safety dossier specific to this derivative

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, so always read the physical product label and consult a healthcare professional for personal concerns.