Displaying 2 results of Equol Stable Isotopes Equol is a compound that is produced by the metabolism of soy isoflavones by gut bacteria in certain individuals. Equol stable isotopes are non-radioactive isotopes of carbon, hydrogen, and nitrogen that are used in research to study the metabolism and effects of equol in the body. These isotopes allow for the precise measurement of equol levels in biological samples and can aid in the development of equol-based therapies for various health conditions.