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An antioxidant produced by normal metabolism. Ubiquinol is the only known fat-soluble antioxidant synthesised by animal cells. It is believed to play an important role in cellular defence against oxidative damage. Ubiquinol can also contribute to the antioxidant defence system by regenerating the active form of vitamin E after that vitamin has reacted with a free radical. (The water-soluble vitamin C can also perform this function.)

Source: Biotechnology Glossary