Glutathione in the Brain Encyclopedia MDPI Role of Glutathione in Cancer: From Mechanisms to Therapies Oral administration of glutamylcysteine increases intracellular glutathione levels above homeostasis in a randomised human trial pilot study ScienceDirect Glutathione is such a critical soldier in our line of defense that our bodies make it themselves. We even have mechanisms that recycle and reuse it. But what happens when our toxic