Used primarily as a stable isotope-labeled internal standard in analytical chemistry, particularly in mass spectrometry and pharmacokinetic studies. Its deuterated structure allows for accurate quantification of mescaline in biological samples by distinguishing it from endogenous compounds and minimizing matrix effects. This compound supports research in forensic toxicology, drug metabolism, and neuroscience by enabling precise tracking and measurement of mescaline levels without altering the chemical behavior significantly. It is not intended for therapeutic or recreational use.