Hydrolyzed Chitosan

Hydrolyzed chitosan is a carbohydrate polymer derived from chitin, a naturally occurring substance found in crustacean shells and fungi. Through hydrolysis—a chemical process that breaks down the polymer chains—it becomes a smaller, more soluble molecule that can penetrate and interact with skin more effectively.In skincare, hydrolyzed chitosan functions primarily as a film-former and humectant. It creates a lightweight, breathable layer on the skin's surface that helps retain moisture whilst also conditioning the stratum corneum (the skin's outermost layer). This dual action makes it usefu…

Hydrolyzed chitosan works through two primary mechanisms. First, as a humectant, its molecular structure allows it to absorb and bind water molecules from the environment and deeper skin layers, drawing them to the surface where they're needed most. Second, it forms a thin, flexible film across the skin that slows transepidermal water loss (TEWL)—the natural evaporation of moisture from the skin.This combination helps to temporarily plump the skin and improve its hydration status. The ingredient's polysaccharide nature also allows it to interact gently with the skin's natural moisturising f…

Hydrolyzed chitosan is typically included in serums, moisturisers, and conditioning treatments. It works well in layered routines and can be applied morning or evening as part of your regular skincare. As a conditioning agent, it doesn't require specific timing or spacing from other ingredients, though it pairs well with other humectants and hydrating actives in your regime.

Hydrolyzed chitosan is generally well-tolerated and considered safe for topical use in cosmetics. Those with shellfish allergies should check product sourcing, as some chitosan is derived from crustaceans, though fungal-derived alternatives exist.