L-Glutamic acid γ-(β-naphthylamide) is primarily used in biochemical research as a substrate for enzyme assays. It is particularly valuable in studying the activity of γ-glutamyl transpeptidase, an enzyme involved in glutathione metabolism and amino acid transport. This compound helps researchers understand enzyme kinetics, substrate specificity, and inhibition mechanisms. Additionally, it is utilized in diagnostic applications to detect and measure enzyme levels in clinical samples, aiding in the diagnosis of liver and kidney diseases. Its role in these studies contributes to advancements in medical and biochemical sciences.