Skin hydrating polysaccharides are derived from several natural sources. This
biopolymer is constructed with simple sugar building blocks that are easily
hydrated in an aqueous environment, thereby creating the gel structure called
hydrogel or hydrocolloid. Polysaccharide that is a biodegradable polymer is
excellent in compatibility with the biological tissues and largely meeting the
consumers’ preferences toward natural products. In this chapter, applications of
biopolysaccharides in cosmetics are subjected to be summarized especially skin
hydrating biopolysaccharide that is incorporated as the active ingredient in
cosmetic product. Mechanisms of skin hydrating effect and in vivo instrumental
evaluation are addressed. Commercial biopolysaccharides are summarized for
further reference in addition to some potential candidates, particularly botanical
polysaccharides. The potential biopolysaccharides, with in vitro activities, are
additionally included. Health benefits of this biopolymer in sufficiently
suppressing dryness of the skin and potentially protecting from and/or treating
wrinkles of the skin acting as antiaging ingredients are highlighted.