Glutathione redox cycle. Glutathione (GSH) is synthesized from the Download Scientific Diagram Frontiers The strategic breakdown: CHAC enzymes as regulators of glutathione homeostasis and disease implications Fig. 4. GHK Cu Hair Growth Now Available: GHK Cu for Healing and Skin Rejuvenation WeCare Pharmacy 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