γ-Glutamyltranspeptidase from equine kidney is widely used in biochemical research and clinical diagnostics. It plays a crucial role in studying glutathione metabolism and amino acid transport mechanisms. In medical diagnostics, this enzyme is employed as a biomarker for liver and biliary tract diseases, helping to detect conditions such as hepatitis, cirrhosis, and bile duct obstruction. Additionally, it is utilized in enzymatic assays to measure γ-glutamyltransferase (GGT) activity in serum, which aids in assessing liver function and alcohol consumption. Its application extends to research in oxidative stress and detoxification processes, providing insights into cellular defense mechanisms.