Gamma-L-Glutamyl-L-glutamic acid is primarily utilized in the field of biochemistry and medical research. It serves as a substrate in enzymatic studies, particularly for investigating the activity of gamma-glutamyl transpeptidase, an enzyme involved in glutathione metabolism. This compound is also used in the development of diagnostic assays to evaluate liver function and detect certain diseases, as abnormal levels of gamma-glutamyl transpeptidase can indicate liver damage or biliary obstruction. Additionally, it plays a role in studying amino acid transport and metabolism in cells, contributing to advancements in understanding cellular processes and potential therapeutic targets.