GPX1 and hyperthyroidism: Co-administration of vitamin E and curcumin improved the activities of enzymatic antioxidant including cytosolic catalase, cytosolic glutathione peroxidase-1 (GPx1), mitochondrial SOD2 and glutathione reductase, and normalized GPx1 protein expression in l-thyroxine-induced hyperthyroidism in rat [33].