Displaying 5 results of Hippuric Acid Stable Isotopes Hippuric acid is a naturally occurring compound found in the urine of humans and animals. It is used as a biomarker for exposure to certain environmental pollutants and drugs. Stable isotopes of hippuric acid can be used to study the metabolism and excretion of this compound in the body. These isotopes can also be used in tracer studies to investigate the fate and transport of hippuric acid in the environment.