definition of metabolite
By Dr Tomislav MeÅ¡troviÄ, MD, PhD. An understanding of metabolism is pivotal to comprehending the phenotypic behavior of all living organisms (including humans) where metabolism is integral to health and proper functioning. Metabolites are the intermediate products of metabolic reactions catalyzed by various enzymes that naturally occur within cells. This term is usually used to describe small molecules, although broader application is often practiced.