Used as a stable isotope-labeled compound in metabolic studies and pharmaceutical research to trace the fate of methylamine groups in biological systems. Its deuterated and carbon-13 enriched methyl group allows precise tracking using mass spectrometry and NMR, making it valuable in drug metabolism, pharmacokinetics, and mechanistic studies of enzymatic reactions involving methyl transfer. Commonly employed in the synthesis of isotopically labeled drugs and biomolecules for quantitative analysis in clinical and preclinical research.