Film Former
HYDROXYPROPYL CHITOSAN
Safety score · 0–100
Good
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A chitosan derivative (from crustacean shells) modified with hydroxypropyl groups — forms a light, breathable film on hair and skin. Well tolerated with a long history of cosmetic use.
Hydroxypropyl chitosan is a semi-synthetic cationic polysaccharide made by reacting chitosan (deacetylated chitin from shrimp/crab shells) with propylene oxide. The modification improves water solubility and film-forming behavior. In cosmetics it is used in hair fixatives, nail lacquers and skin conditioners where it deposits an invisible, breathable film. Not classified as a CMR substance; biodegradable; generally considered low-irritation. The main caveat is shellfish provenance — not vegan, and theoretically a concern for shellfish-allergic users (though allergens are proteins largely removed in processing).
Function
Skin benefits
- Forms breathable film on hair and skin
- Improves feel and conditioning
- Biodegradable cationic polymer
Known concerns
- Shellfish-derived — potential allergen concern for sensitive users
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related film formers
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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.