Ubiquinol
Ubiquinol (CoQH2) is a reduced form of coenzyme Q10 (CoQ10) that acts as an active antioxidant that prevents the initiation and propagation of lipid peroxidation in biological membranes and human low-density lipoprotein (LDL). It plays an essential role in maintaining cellular defense against oxidative damage and also sustains the effects of vitamin E by regenerating the vitamin from the tocopheroxyl radical, but ubiquinol is not classified as a vitamin because it is synthesized by humans. There are varying concentrations of ubiquinol in foods, OTC products and dietary supplement products.