Displaying 8 results of Amphetamine Stable Isotopes Amphetamine stable isotopes are isotopes of the drug amphetamine that have a stable atomic nucleus and do not decay over time. These isotopes are useful in research, particularly in drug metabolism studies, as they can be used to track the fate of amphetamine within the body. They are also used in forensic toxicology to detect the presence of amphetamine in biological samples. The most commonly used stable isotopes of amphetamine are carbon-13 and nitrogen-15.