Barrier support ingredient
Chitosan
Chitosan is a linear polysaccharide derived by partial deacetylation of chitin (found in crustacean shells, insect exoskeletons, and fungal cell walls). The degree of deacetylation determines its cationic charge density — cosmetic-grade chitosan is 75–90% deacetylated. Its cationic nature gives it substantive affinity for skin, excellent film-forming properties, and antimicrobial activity. Used in Korean skincare as a barrier-supportive, skin-conditioning, and gentle anti-microbial active.
Also known as: deacetylated chitin
film-formingbarrier-repairantimicrobialskin-conditioning
Benefits
- ✓Chitosan is a cationic polysaccharide derived from chitin (crustacean shells) that adsorbs tightly to the negatively charged skin surface, forming a breathable, moisture-retaining film with substantive skin conditioning
- ✓The cationic character of chitosan gives it inherent antimicrobial activity against gram-positive bacteria and fungi — relevant for acne-prone and oily skin formulations
- ✓Low-molecular-weight chitosan fractions can penetrate into the stratum corneum, reinforcing the lipid barrier and contributing to trans-epidermal water loss reduction
Watch for
- ⚠Derived from crustacean shells — not vegan or shellfish-allergy safe; shellfish-allergic individuals should exercise caution, though documented topical reactions are rare
- ⚠Highly cationic — incompatible with anionic polymers (e.g., carbomer, hyaluronic acid at low ionic strength) in formulations; can cause turbidity or precipitation if mixed improperly
Compatibility
✓ Works well with
+ Panthenol+ Ceramide NP+ Beta-Glucan
× Use with care
× Carbomer
