Levan

Levan is a naturally occurring polysaccharide—a type of complex carbohydrate—composed of fructose units linked together in a specific chain structure. It is produced by certain microorganisms and is nontoxic and biocompatible, making it suitable for topical skincare applications. In formulations, levan functions primarily as a film former and skin protectant.The ingredient is water-soluble, which allows it to dissolve readily in liquid formulations whilst maintaining its ability to create a protective layer on the skin's surface. This dual property makes it useful in moisturising and barrie…

Levan works through two main mechanisms. First, as a film former, it deposits a lightweight protective layer on the skin's surface. This layer reduces water loss from the epidermis, supporting hydration without occluding pores significantly. Second, its polysaccharide structure is hygroscopic, meaning it can attract and retain water molecules, further contributing to skin hydration.The ingredient's biocompatibility—its ability to integrate with skin without triggering adverse reactions—underpins its anti-irritant properties. Research suggests it may support skin barrier function, though the…

Levan is typically incorporated into serums, moisturisers and barrier-repair products at concentrations determined by the formulator. As a film former, it works best in products designed to be left on the skin. It pairs well with other hydrating ingredients like humectants and occlusive agents. Since it is generally well-tolerated, it can be used daily as part of a regular skincare routine, though individual tolerance may vary depending on product formulation and skin condition.

Levan is non-toxic and biocompatible, making it well-tolerated by most skin types. No significant safety concerns have been documented in cosmetic use, though as with any ingredient, patch testing is advisable for individuals with known sensitivities to polysaccharides.