Q10 belongs to a class of molecules characterized by their benzoquinone ring structure at the end of an isoprenoid side chain, similar to a medieval flail. The length of the sidechain determines the designation of the coenzyme, with CoQ10 possessing ten isoprenoid units in its tail. This fat-soluble substance, which resembles a vitamin, is present in all respiring eukaryotic cells, primarily in the mitochondria. It is a component of the electron transport chain and participates in aerobic cellular respiration, which generates energy in the form of ATP. Ninety-five percent of the human body’s energy is generated this way. Therefore, those organs with the highest energy requirements—such as the heart, liver, and kidney—have the highest CoQ10 concentrations.