Xanthan gum is a polysaccharide produced from the fermentation of plant carbohydrates by the bacterium Xanthomonas campestris. Monosaccharide constituents include glucose and mannose 1. It is commonly added to foods, where it serves as a stabilizing agent and a thickener 2. Xanthan gum is approved by the U.S. Food and Drug Administration (FDA) for use as a food additive (21CFR172.695) 3. Xanthan gum is also used as a skin conditioning agent, to stabilize oil-in-water mixtures and to thicken the texture of cosmetics and personal care products 4.