Used as a labeled internal standard in mass spectrometry for accurate quantification of benzylamine and related compounds in complex biological and environmental samples. Applied in metabolic studies and pharmacokinetic research to trace and analyze the behavior of benzylamine derivatives in living organisms. Employed in NMR spectroscopy as a deuterated reference compound to enhance the precision of structural and dynamic studies of organic molecules. Utilized in the development of deuterated pharmaceuticals to improve drug stability and metabolic properties. Supports research in organic synthesis, particularly in reactions where deuterium labeling is essential for mechanistic investigations or isotopic effect studies.