Apart from being a cofactor in the mitochondrial electron transport chain, Co Q10 in its reduced form (ubiquinol or CoQ10 H2) serves as an important antioxidant in both mitochondria and lipid membranes, where it protects our cells in their battle against the destructive effects of free radicals. Additionally, CoQ10 is essential in vitamin E regeneration. Ubiquinol, inhibits protein and lipid oxidation in cell membranes, and helps to minimize oxidative injury to DNA. CoQ10 is an integral part of the respiratory chain and thereby located exactly where the free radicals are generated, in the mitochondria.