Coenzyme Q10 (CoQ10), also known as ubiquinone, is a fat-soluble, vitamin-like compound naturally produced by the human body and found in certain foods. It plays a critical role in energy production, cellular protection, and overall health. Structurally, CoQ10 consists of a benzoquinone ring (responsible for its antioxidant activity) and a polyisoprenoid tail (which makes it lipid-soluble and allows it to embed in cell membranes).