Bupropion morpholinol D6 is primarily used in research and analytical chemistry as a deuterated internal standard. It aids in the precise quantification and analysis of bupropion and its metabolites in biological samples, such as blood, urine, or plasma. This compound is particularly valuable in pharmacokinetic studies, drug metabolism research, and forensic toxicology, where accurate measurement of bupropion levels is essential. Its deuterated form ensures minimal interference during mass spectrometry, enhancing the reliability and sensitivity of analytical methods.