D-Saccharic acid potassium salt is widely used in biochemical research as a reagent for studying carbohydrate metabolism. It serves as a substrate in enzymatic assays to analyze the activity of specific enzymes involved in sugar oxidation pathways. In the pharmaceutical industry, it is utilized in the formulation of certain medications, particularly those targeting metabolic disorders. Additionally, it finds application in the food industry as a stabilizer and pH regulator in various products. Its chelating properties also make it useful in certain industrial processes where metal ion control is required.