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However, as a result of extended exposure or high serum levels of cyclosporine, patients may develop side effects such as hepatotoxicity and cholestasis

So, its not surprising that Glutathione is known as the "Master Antioxidant"*
PLoS One 5 , e15447 (2010)

Surprisingly, we do not uncover any clear evidence for a deleterious effect of the potent oxidizing agent, superoxide, though its level does change with age in WT flies
