L-Glutamic acid-15N is widely used as a stable isotope-labeled compound in various research and industrial applications. In metabolic studies, it serves as a tracer to investigate amino acid metabolism, protein synthesis, and nitrogen cycling in biological systems. Its labeled nitrogen atom allows for precise tracking and analysis using techniques like NMR spectroscopy and mass spectrometry. In the field of nutrition, it helps in understanding dietary protein utilization and amino acid requirements. Additionally, it is employed in pharmaceutical research to study drug metabolism and the development of labeled drugs for diagnostic purposes. Its use in agricultural research aids in analyzing plant nitrogen uptake and optimizing fertilizer efficiency. Overall, L-Glutamic acid-15N is a valuable tool in advancing scientific understanding across multiple disciplines.