Pseudoalteromonas Exopolysaccharides

Pseudoalteromonas exopolysaccharides are complex carbohydrate polymers produced by a naturally occurring marine bacterium. These molecules form a protective, gel-like matrix that has been incorporated into skincare formulations for their skin conditioning properties.In cosmetics, they function primarily as humectants and film-formers, meaning they help attract water to the skin surface and create a light protective layer. This positions them as part of the broader category of marine-derived ingredients used to support skin hydration and comfort.

These exopolysaccharides work through two main mechanisms. First, their hydrophilic (water-loving) structure allows them to draw moisture from the environment and deeper skin layers to the outer surface — a humectant effect. Second, they form a thin film on the skin that is breathable yet provides a degree of protective coverage without the heaviness of traditional occlusive ingredients.The polysaccharide structure also means they can interact with the skin's own natural moisturising factor, potentially enhancing hydration synergy when used alongside other conditioning agents.

This ingredient works well in lightweight serums, hydrating toners, and moisturisers aimed at improving skin texture and hydration. It pairs effectively with other humectants like glycerin and hyaluronic acid, and with barrier-supporting ingredients. Use it daily as part of your regular hydration routine; it is suitable for layering with other products and does not typically require specific timing.

Generally considered safe and well-tolerated across skin types. Those with sensitivities to fermented or marine-derived ingredients should patch-test first.