Used primarily as a stable isotope-labeled internal standard in mass spectrometry and gas chromatography-mass spectrometry (GC-MS) analyses. Its deuterated structure allows for accurate quantification of n-tetradecane and related hydrocarbons in complex mixtures by providing a distinct mass signal that does not interfere with the native compound. Commonly applied in environmental testing, petrochemical research, and metabolic studies where precise tracking and measurement of hydrocarbon components are required. Its high isotopic purity ensures reliable calibration and improved analytical accuracy.