Hair Conditioning
HYDROLYZED FIBROIN
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
Hydrolyzed silk fibroin — peptides from the silkworm cocoon protein. A classic hair-conditioning ingredient with a clean safety record.
Hydrolyzed fibroin is produced from silk fibroin, the structural protein of Bombyx mori silk cocoons, by enzymatic or acid hydrolysis to 1-10 kDa peptides. It is highly substantive to keratin, giving a smooth, silk-like finish on hair. The amino-acid profile is dominated by glycine, alanine and serine. CIR has reviewed silk-protein derivatives favourably. Silk allergy in consumers is rare but documented (more common in silkworm-occupational exposure). Not vegan; sourcing in line with insect-welfare concerns is a choice for some brands.
Function
Skin benefits
- Silk-derived peptides — smoothing and film-forming on hair
- Substantive to keratin
- Pleasant sensory finish
Known concerns
- Silkworm-derived — not vegan
- Rare silk-protein sensitization cases
- Sourcing/ethical considerations
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.