decreased glutathione peroxidase activity abnormal circulating glutathione peroxidase activity decreased circulating glutathione peroxidase activity 2026-02-17T19:29:12Z decreased circulating GSH-Px activity decreased circulating GPX activity decreased circulating non-selenium glutathione peroxidase activity reduced circulating glutathione:hydrogen-peroxide oxidoreductase activity decreased circulating GSHPx activity decreased plasma GSH peroxidase activity decreased circulating selenium-glutathione peroxidase activity decreased serum GSH peroxidase activity MP:0014929 reduction in the ability to catalyze the reaction: 2 glutathione + hydrogen peroxide = oxidized glutathione + 2 H2O in the blood decreased circulating enzyme/coenzyme activity