SciELO Brasil Oxidative stress: molecular perception and transduction of signals triggering antioxidant gene defenses Oxidative stress: molecular perception and transduction of signals triggering antioxidant gene defenses 2700 MG Liposomal Glutathione Supplement, Max Jamaica Ubuy 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 Assay for quantitative determination of glutathione and glutathione disulfide levels using enzymatic recycling method Nature Protocols