Snapshot
- Overview
- A shellfish-derived polymer that forms a light film to hold in moisture.
- Category
- Barrier Support, Skin Conditioning, Hydration
- Type
- Film Former
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.
Like this ingredient?
Our take
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.
What it does
Skin Benefits
Forms a light, flexible veil that helps skin retain moisture and feel softer throughout the day.
Where you'll find it
Uses in Skincare & Cosmetics
Frequently added to hydrating serums, sheet masks, and creams to boost smooth application and reduce tightness after cleansing.
Before you use it
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.
Products with Chitosan
