Ascorbate and Glutathione: The Heart of the Redox Hub1 As a cycling fanatic it is always important to take care of your skin at all time! How many times have we forgotten to put sunblock or cleanse our body? Don't worry! @ TJ. Glutathione peroxidase is an important enzyme in cellular antioxidant defense systems, detoxifying peroxides and hydroperoxides. As a component of the glutathione cycle, it protects the liver from reactive oxygen metabolites. Selenocysteine Glutathione reductase Wikipedia The ascorbateglutathione cycle coming of age