2,3-Diketo-L-gulonic acid is a key intermediate in the biosynthesis of L-ascorbic acid (vitamin C). It is the direct precursor to L-ascorbic acid in the Reichstein-Grüssner synthesis, a major industrial route for vitamin C production. The compound is enzymatically converted to ascorbic acid by gulonolactone oxidase. Its primary industrial significance lies in the large-scale manufacture of vitamin C, a vital nutrient and pharmaceutical ingredient. Beyond its role as a biosynthetic intermediate, it is also studied in the context of vitamin C metabolism and oxidative stress. In pharmaceutical formulations, derivatives or related compounds may be explored as functional excipients for their antioxidant properties. The compound is typically handled as a solid and requires specific storage conditions due to its reactivity and sensitivity. Research into its properties and potential applications beyond vitamin C synthesis remains an area of interest in biochemistry and pharmaceutical sciences.