Coenzyme Q10 (CoQ), also known as ubiquinone, is a naturally-occurring substance classified as a fat-soluble quinone with characteristics that are common to vitamins. Its chemical structure is similar to that of vitamin K, and it is found naturally in the tissues of animals and plants.
Coenzyme Q10 is one of the substances in the chain of reactions which produces energy in the metabolism of food. Because of the necessity of CoQ10 for energy production, almost every cell of a living organism contains CoQ. The CoQ content varies in different organs, being highest in those that produce large amounts of energy. In humans, CoQ is found in relatively high amounts in the heart, liver, kidney, and pancreas.

CoQ helps drive the mitochondrial energy production vital to all body functions. The functioning of all organs depends on each cell having adequate levels of CoQ to provide life-sustaining energy.