Coenzyme Q10, or CoQ10, is a naturally occurring antioxidant found in every cell of the body. It is vital for the production of adenosine triphosphate (ATP), the primary energy carrier in cells. Like PQQ, CoQ10 is involved in mitochondrial function, providing energy necessary for cellular activities. The body's levels of CoQ10 can decrease with age, certain medical conditions, and the use of specific medications, particularly statins.