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.
NoneFilm formerNot veganEvidence: Medium
BenefitModerate 1.5 / 4
Barrier support
Hydration
RiskLow 1 / 4
Sensitization
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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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.
Spotty Labs