Chitosan

Chitosan is a marine-derived, cationic polysaccharide made by deacetylating chitin from crustacean shells. It's used as a film-former to improve skin feel, limit moisture loss with a breathable layer, and support formula stability.
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Ingredient Snapshot

Overview
A shellfish-derived polymer that forms a light film to hold in moisture.
Category
Barrier Support, Skin Conditioning, Hydration
Type
Film Former

Ingredient Ratings

Overall Rating

Good

Comedogenic Risk

None

Skin Benefits

Forms a light, flexible veil that helps skin retain moisture and feel softer throughout the day.

Uses In Skincare & Cosmetics

Frequently added to hydrating serums, sheet masks, and creams to boost smooth application and reduce tightness after cleansing.

Comedogenic Rating

This ingredient is not typically evaluated for comedogenicity, and no standardized rating is available.

Safety

Usually low irritation and well tolerated. It’s derived from crustacean shells; shellfish-allergic individuals typically react to proteins, but a cautious patch test is advisable. No common cosmetic restrictions reported.

Is Chitosan a Good Ingredient?

A well-studied film-forming polysaccharide that strengthens hydration and feel with generally low irritation at cosmetic use levels; performance is reliable across typical formulations. That mix of usefulness and tolerability lands it a Good rating rather than Great.

Products with Chitosan

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