Aphanothece Sacrum Exopolysaccharides

Aphanothece sacrum exopolysaccharides are complex carbohydrate polymers produced by a freshwater cyanobacterium (blue-green algae). In skincare formulations, these polysaccharides function as a multitasking ingredient that stabilises emulsions, controls viscosity, and creates a protective film on the skin surface.The ingredient works primarily as a structuring agent within the formula itself, helping to maintain consistency and prevent separation of oil and water phases. When applied to skin, it deposits a thin, flexible layer that can support the skin's moisture barrier.

Aphanothece sacrum exopolysaccharides are hydrophilic polymers, meaning they have an affinity for water. When incorporated into a skincare product, they absorb water and swell, creating a gel-like consistency that stabilises the formula and prevents ingredients from separating.On the skin, these polysaccharides form a thin polymeric network that sits on the surface. This film reduces water evaporation from the stratum corneum (the outermost skin layer) without occluding the skin completely, allowing it to breathe while supporting hydration.

This ingredient is typically used as part of a complete skincare formula rather than in isolation. It will be most effective when used as directed within a product designed to support hydration—for example, a hydrating serum, moisturiser, or essence. Apply to clean skin and layer with other products as needed for your routine.

Aphanothece sacrum exopolysaccharides are generally well-tolerated and considered safe for topical use in cosmetics. Allergic or sensitising reactions are uncommon, though those with sensitivities to algal derivatives should patch-test first.