KERATIN
Conditioning Agent
Good
CAS Number: 68238-35-7
About KERATIN
A natural structural protein found in hair, skin, and nails — used to strengthen and condition hair and improve skin texture. CIR-reviewed and deemed safe, though animal-derived sources must be pathogen-free.
Detailed Analysis
Keratin (CAS 68238-35-7) is a fibrous structural protein naturally present in vertebrate hair, skin, and nails, characterized by high cystine content. The CIR Expert Panel concluded that keratin and related derivatives are safe as cosmetic ingredients at current use concentrations. Key concerns relate to sourcing: animal-derived keratin must be free of detectable infectious pathogens (BSE, CJD, HIV). Functions as both hair and skin conditioning agent, improving tensile strength, moisture retention, and surface smoothness of hair and skin.
What It Does
Skin Benefits
- ✓ Strengthens and conditions hair
- ✓ Improves hair elasticity and reduces breakage
- ✓ Skin conditioning — improves texture and smoothness
- ✓ Helps retain moisture in hair and skin
Known Concerns
- ⚠ Animal-derived sources must be verified free of BSE, CJD, and other pathogens
- ⚠ Potential heavy metal or pesticide residue contamination from source materials
- ⚠ Some keratin treatments (hair straightening) use formaldehyde, though keratin itself is not the concern
Safety Score
Good
Based on EU regulatory data, published safety research, and ingredient function analysis.
References
EU CosIng Database
European Commission cosmetic ingredient registry
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Download LuxSenseThis information is for educational purposes only and does not constitute medical advice. Always consult a healthcare professional for skin concerns or allergies.