Catabolism of extracellular glutathione supplies cysteine to support tumours Nature 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 Supplement 2,000mg Per Serving, 240 Veggie Capsules NatureBell Application of glutathione depletion in cancer therapy: Enhanced ROS based therapy, ferroptosis, and chemotherapy ScienceDirect