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 Glutathione and Brain Health: What It Is, Sources, And Benefits The Cystine Glutamate Antiporter System xc in Health and Disease: From Molecular Mechanisms to Novel Therapeutic Opportunities Jan Lewerenz, Sandra J. Hewett, Ying Huang, Maria Lambros, Peter W. Gout, Peter W. Kalivas, The glutathione cycle shapes synaptic glutamate activity PNAS