Fig. 4. 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 redox cycle. Glutathione (GSH) is synthesized from the Download Scientific Diagram Ascorbate Glutathione Cycle and Biotic Stress Tolerance in Plants Springer Nature Link Now Available: GHK Cu for Healing and Skin Rejuvenation WeCare Pharmacy GHK Cu Hair Growth