Glutathione Peroxidase: An Antioxidant Enzyme In Health And Disease The functions of glutathione peroxidase in ROS homeostasis and fruiting body development in Hypsizygus marmoreus Applied Microbiology and Biotechnology Springer Nature Link 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 OXIDATIVE STRESScan contribute to hypothyroid symptoms When the body has to deal with too much Oxidative Stress from inflammation, then the enzyme Glutathione Peroxidase [GPx] has to work overtime to inactivate damaging "