Coenzyme Q10, often abbreviated as CoQ10, is a naturally occurring compound in the human body that plays a crucial role in the production of energy within cells. It is a fat-soluble antioxidant, similar to a vitamin, and is present in the mitochondria, where it assists in the synthesis of adenosine triphosphate (ATP), the primary source of cellular energy. CoQ10 also helps protect cells from oxidative damage and supports various physiological functions.