What it is
Dextran is a branched polysaccharide composed of glucose monomers linked predominantly through alpha-1,6 glycosidic bonds, produced by bacterial fermentation of sucrose. In skincare formulas it contributes to viscosity, helps bind ingredients together, and can form a light surface film that supports a smooth feel. It is water soluble and frequently used in low concentrations as a functional auxiliary rather than as a primary active.
Safety & warnings
Dextran is a large, well-tolerated polysaccharide generally regarded as low risk for irritation or sensitization in topical use. It is not a known fragrance allergen and is not a comedogenic oil.
Origin & sourcing
Naturally derived. Dextran is typically produced by fermentation of sucrose using bacteria such as Leuconostoc species, then purified into a defined polysaccharide.
Questions everyone asks
What does dextran do in a sunscreen?
It acts mainly as a film former and binder, helping create a smooth, cohesive layer and supporting the texture of the formula.
Is dextran natural?
Yes. It is a polysaccharide produced by bacterial fermentation of sugar, then purified for cosmetic use.