Allyl-D-glucuronide sodium salt is a sodium salt derivative of D-glucuronic acid conjugated with an allyl group. It is a synthetic, water-soluble compound that serves as a key biochemical tool. Its primary application is in the field of drug metabolism and toxicology research. This compound is widely used as a substrate for various UDP-glucuronosyltransferase (UGT) enzymes. Researchers employ it in *in vitro* assays to study the glucuronidation metabolic pathway, which is a major Phase II detoxification process for many drugs and xenobiotics. By measuring the enzymatic activity, it aids in assessing drug-drug interaction potential and individual metabolic variations. While its core utility is as a specialized biochemical reagent, its well-defined structure containing both a sugar acid moiety and a reactive allyl group also makes it a potential building block in synthetic chemistry for the preparation of more complex glycoconjugates or probes.