Diosmetin 7-O-β-D-Glucuronide Sodium Salt is the water-soluble sodium salt of a key phase II metabolite of the flavonoid diosmetin. Primarily used in pharmaceutical and biochemical research as a reference standard for studying flavonoid metabolism, pharmacokinetics (absorption, distribution, metabolism, and excretion), and bioavailability. Its glucuronide structure makes it valuable for investigating oxidative stress pathways, cellular protection mechanisms, and analytical quantification of flavonoid conjugates in biological samples from plant extracts or traditional herbal medicines. The enhanced solubility of the sodium salt form supports its application in in vitro assays, in vivo studies, and formulation development for nutraceuticals derived from natural sources.