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 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 Phase II Glutathione Conjugation Metabolism of Herbicides or Xenobiotics in Plants passel Measurement of superoxide dismutase, catalase and glutathione peroxidase in cultured cells and tissue Nature Protocols