Aminorex-d5 is primarily used in research and analytical laboratories as an internal standard or reference compound in mass spectrometry and chromatography studies. Its deuterated form allows for precise tracking and quantification of non-deuterated aminorex in biological samples, such as urine or blood, during drug metabolism and pharmacokinetic research. This application is particularly valuable in forensic toxicology, where it aids in detecting and analyzing aminorex and its analogs in cases of drug abuse or doping. Additionally, it supports the development and validation of analytical methods for accurate detection of stimulant substances in various matrices.