Used as a stable isotope-labeled compound in research and analytical studies, particularly in the field of biochemistry and metabolomics. It serves as an internal standard in mass spectrometry to enhance the accuracy of quantitative analysis of methionine and related metabolites. This labeled compound is also valuable in tracing metabolic pathways and studying protein synthesis, degradation, and turnover in biological systems. Additionally, it aids in investigating the role of methionine in various physiological and pathological processes, such as liver function and oxidative stress. Its deuterated form ensures minimal interference in experimental results, making it a reliable tool in advanced scientific studies.