Figure 10. Glutathione Peroxidase Catalase Cooperativity Is Required for Resistance to Hydrogen Peroxide by Mature Rat Oligodendrocytes Journal of Neuroscience 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 A purine derivative, paraxanthine, promotes cysteine uptake for glutathione synthesis ScienceDirect A purine derivative, paraxanthine, promotes cysteine uptake for glutathione synthesis ScienceDirect