Reduced Glutathione Complex 1 Methylxanthine enhances memory and neurotransmitter levels PLOS One 93% of Americans use caffeine daily, but nearly 50% are slow caffeine metabolizers?! That means millions of people experience more crashes, anxiety, and sleep issues from their morning coffee than the clean The changing faces of glutathione, a cellular protagonist., Volume I Frontiers Research Topic 93% of Americans use caffeine daily, but nearly 50% are slow caffeine metabolizers?! That means millions of people experience more crashes, anxiety, and sleep issues from their morning coffee than the clean Paraxanthine may represent the next wave of clean energy drinks with smoother stimulation, fewer jitters, and potentially better focus.