Displaying 2 results of Etonogestrel Stable Isotopes Etonogestrel is a synthetic hormone used in contraceptive implants. Stable isotopes of etonogestrel are used for research and pharmacokinetic studies to determine drug absorption, distribution, metabolism, and excretion. Stable isotopes are non-radioactive forms of elements that can be tracked through biological systems. These isotopes can provide valuable information for drug development and safety assessments.