abnormal glutathione peroxidase activity increased glutathione peroxidase activity 2012-01-26T01:31:29Z MP:0011602 MPheno.ontology csmith greater ability to catalyze the reaction: 2 glutathione + hydrogen peroxide = oxidized glutathione + 2 H2O increased GSH peroxidase activity increased glutathione:hydrogen-peroxide oxidoreductase activity increased non-selenium glutathione peroxidase activity increased reduced glutathione peroxidase activity increased selenium-glutathione peroxidase activity increased peroxidase activity