Alpha-Glucan Oligosaccharide-1

Alpha-glucan oligosaccharide-1 is a carbohydrate-derived humectant — a type of ingredient that attracts and binds water molecules to the skin's surface. It is typically produced through the enzymatic breakdown of starch or similar polysaccharides, resulting in a smaller, more penetrable molecule.

In skincare formulations, it functions as both a humectant and a skin conditioning agent, helping to improve skin feel and maintain moisture levels without leaving a heavy residue.

Alpha-glucan oligosaccharide-1 works through osmotic action. Its molecular structure allows it to absorb water from the environment and deeper skin layers, drawing it toward the stratum corneum. This hygroscopic property helps to increase skin hydration without creating a barrier film.

Unlike heavier occlusive moisturisers, it functions through moisture attraction rather than occlusion, making it a lighter hydration option suitable for layering with other skincare ingredients.

Alpha-glucan oligosaccharide-1 is most effective when used in formulations that support a hydrated microenvironment — pair it with occlusives (such as plant oils or ceramides) to lock in the moisture it attracts. It works well in serums, essences, and lightweight moisturisers, and can be used daily as part of your routine.