L-Leucine-15N is widely used in metabolic research and studies involving protein synthesis. Its labeled nitrogen atom allows for precise tracking and analysis of amino acid metabolism in biological systems. This compound is particularly valuable in stable isotope labeling experiments, where it helps elucidate pathways of nitrogen incorporation and turnover in proteins. It is also employed in nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry to study protein structure, dynamics, and interactions. Additionally, L-Leucine-15N is utilized in nutritional research to investigate the role of leucine in muscle protein synthesis and its impact on muscle growth and recovery. Its applications extend to clinical studies, where it aids in understanding metabolic disorders and developing therapeutic strategies.