Can I use Carbomer with Chitosan?
Use with care
Carbomer and Chitosan can interfere with each other or compound irritation when applied together. Introduce them on alternate days, or separate them between your AM and PM routines, and patch-test before combining.
ChitosanBarrier support
- ✓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
- ⚠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
