Measurement of superoxide dismutase, catalase and glutathione peroxidase in cultured cells and tissue Nature Protocols Glutathione Mediated Neuroprotective Effect of Purine Derivatives Paraxanthine, a compound your body creates when it breaks down caffeine, is being touted by some as a better alternative to coffee, offering energy and focus without the jitters. Click the link Catalase and Glutathione Peroxidase Are Equally Active in Detoxification of Hydrogen Peroxide in Human Erythrocytes ScienceDirect