Used extensively in nuclear magnetic resonance (NMR) spectroscopy as a solvent or internal standard due to its deuterium atoms, which provide a clear and distinct signal without interfering with the analysis of other hydrogen atoms in the sample. It is particularly valuable in studying molecular structures and dynamics in organic chemistry and biochemistry. Additionally, it serves as a labeling agent in metabolic studies to trace biochemical pathways and understand reaction mechanisms. Its stability and non-reactive nature make it suitable for use in various research applications where precise isotopic labeling is required.