Uridine 5'-diphosphate sodium salt is widely used in biochemical research as a substrate for enzymes involved in nucleotide sugar metabolism. It plays a critical role in glycosylation processes, where it acts as a donor of sugar moieties in the synthesis of glycoproteins and glycolipids. This compound is also utilized in studies related to carbohydrate metabolism and the biosynthesis of complex carbohydrates. Additionally, it serves as a precursor in the production of other nucleotide sugars, which are essential for various cellular functions. Its application extends to the development of assays for enzyme activity and the investigation of metabolic pathways in both normal and diseased states.