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 Oral administration of glutamylcysteine increases intracellular glutathione levels above homeostasis in a randomised human trial pilot study ScienceDirect What are the potential side effects and risks of overdose with oral glutathione (GSH) tablets? Oral Glutathione Equivalent to IV Therapy! Clinical Education