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 A purine derivative, paraxanthine, promotes cysteine uptake for glutathione synthesis ScienceDirect Amazon.com: Resonex Catalase, Superoxide Dismutase (SOD), and Glutathione Frequencies 120 Tablets : Health & Household Paraxanthine, a compound the body naturally produces when it breaks down caffeine, is starting to appear in energy drinks and even some coffee products as a potential caffeine alternative." Read our latest Paraxanthine enhances memory and neuroplasticity more than caffeine in rats Experimental Brain Research Springer Nature Link