Used as a stable isotope-labeled internal standard in analytical chemistry for the accurate quantification of N-nitrosodimethylamine (NDMA) in various matrices such as water, pharmaceuticals, and food products. Its primary application is in mass spectrometry and gas chromatography methods, where it helps correct for matrix effects, instrument variability, and losses during sample preparation. Due to its deuterated structure, it behaves similarly to the target analyte but is distinguishable by the detector, enabling precise and reliable measurement of NDMA contamination, which is critical for regulatory compliance and safety assessments.