Xanthan gum, a polysaccharide produced by the fermentation of Xanthomonas campestris, has become a staple ingredient in cosmetics for its exceptional thickening, stabilizing, and hydrating properties. With a complex chemical structure (C₃₅H₄₉O₂₉)ₙ, this biopolymer forms a high-viscosity network in aqueous solutions, making it indispensable for formulating stable emulsions and gels. Discovered in the 1960s, xanthan gum's natural origin and biocompatibility have driven its widespread use in both personal care and pharmaceutical applications.