Catalase and Glutathione Peroxidase Are Equally Active in Detoxification of Hydrogen Peroxide in Human Erythrocytes ScienceDirect 1 Methylxanthine enhances memory and neurotransmitter levels 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 Measurement of superoxide dismutase, catalase and glutathione peroxidase in cultured cells and tissue Nature Protocols