L-Tryptophan-15N2 is widely used in research and scientific studies as a stable isotope-labeled compound. It serves as a tracer in metabolic studies, helping scientists understand the pathways and mechanisms of amino acid metabolism in biological systems. This labeled form is particularly valuable in nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry, where it aids in the precise analysis of protein synthesis, degradation, and turnover rates. Additionally, it is employed in nutritional research to investigate the role of tryptophan in diet and its conversion into essential molecules like serotonin and niacin. Its use in isotopic labeling also supports advancements in pharmacokinetics and drug development studies.