L-Methionine-13C is widely used in research and diagnostic applications, particularly in the field of stable isotope labeling. It serves as a tracer in metabolic studies, allowing scientists to track and analyze the pathways and mechanisms of methionine metabolism in biological systems. This labeled compound is also employed in nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry to enhance the accuracy of detecting and quantifying methionine in complex samples. Additionally, it plays a critical role in protein synthesis studies, helping researchers understand protein turnover and amino acid utilization in various organisms. Its application extends to nutritional research, where it aids in examining the dietary impact of methionine on health and disease.