Hair Conditioning
OXIDIZED KERATIN
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
Keratin that has been chemically oxidised (typically via peroxide or performic acid) to break disulfide bonds. A hair-repair film-former — mostly safe but animal-origin.
Oxidized keratin is derived from animal keratin (wool, horn, feather, hoof) that has been treated with an oxidant such as performic acid to cleave disulfide bonds, converting cystine to cysteic acid and yielding water-soluble keratin peptides. These peptides are substantive to damaged hair, depositing a repairing protein film. Oxidation can produce some reactive sulfur species that are generally removed during processing. Animal-origin, not vegan. Protein hydrolysates in hair-coloring or relaxer products have case-report sensitisation, which applies to keratin too. No EU restriction.
Function
Skin benefits
- Keratin peptides — substantive film-forming on hair
- Marketed for damaged-hair repair
- Adds protein structure to hair shaft
Known concerns
- Oxidation may generate reactive disulfide/sulfonic-acid species
- Animal-origin (wool, horn, hooves) — not vegan
- Protein hydrolysate sensitisation in hair products documented
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related hair conditionings
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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.