Chitosan
Chitosan is a sugar derived from the outer skeleton of shellfish, such as crab, lobster, and shrimp. In cosmetics, it forms a protective film on the skin or hair, helping to retain moisture and provide a smooth feel. It is also used for its antimicrobial properties.
Film formerNot vegan
BenefitModerate 1.5 / 4
Barrier support i1.5 / 4
Whether it supports the skin barrier — restoring lipids, reducing water loss, aiding barrier repair, or strengthening the skin’s protective function.
Hydration i1 / 4
Whether the ingredient helps increase the skin’s water content — humectants that attract water, ingredients that reduce water loss, or ones that make skin feel less dry.
RiskLow 1 / 4
Sensitization i1 / 4
Risk of allergic contact dermatitis or immune-based reactions. Fragrance allergens, preservatives, botanicals, and some dyes may score here.
Rated by SpottyLabs' ingredient methodology, independent of brands.
What it helps with
- Forms protective film
- Moisture retention
- Antimicrobial properties
Things to watch
- Potential for shellfish allergy
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Frequently asked questions
- Is chitosan safe for people with shellfish allergies?
- Individuals with shellfish allergies should avoid products containing chitosan, as it is derived from shellfish and may trigger an allergic reaction.
- What does chitosan do in skincare?
- In skincare, chitosan forms a breathable film on the skin's surface, which helps to reduce moisture loss and protect against environmental factors. It can also contribute to a smoother skin feel.
