Glycosyl Trehalose

Glycosyl trehalose is a disaccharide (a type of sugar) derived from natural sources. It functions in skincare formulations as a humectant and film-former, meaning it helps draw moisture into the skin and can create a protective barrier on the surface.The ingredient is relatively uncommon in skincare products, appearing in roughly 0.4% of formulations. Its presence is typically part of multi-ingredient systems designed to address specific skin concerns, rather than as a standalone active.

As a humectant, glycosyl trehalose draws water from the environment and deeper skin layers to the surface, helping to maintain skin hydration. Its film-forming capacity allows it to sit on the skin and minimise moisture loss.Emerging research suggests it may also help protect skin proteins from glycation — a process where reducing sugars bind to proteins without enzymatic control, leading to structural damage over time. However, most evidence comes from laboratory and ex vivo studies, and more research in living skin is needed to confirm its practical effectiveness at typical product concen…

Glycosyl trehalose is almost always part of a formulated product rather than used alone. Use it as directed within your chosen serum, moisturiser or treatment. There is no evidence that higher concentrations deliver proportionally better results, so follow the product instructions and allow several weeks of consistent use before assessing benefits.

Glycosyl trehalose is generally well-tolerated and suitable for most skin types. It is not a known irritant or sensitiser, though always patch-test if you have highly reactive skin.