Phenyl sulfate, indoxyl sulfate and p cresyl sulfate decrease glutathione level to render cells vulnerable to oxidative stress in renal tubular cells PLOS One Sacramento Glutathione (GSH) is a crucial endogenous "master" antioxidant that protects the heart by reducing oxidative stress, neutralizing lipid peroxides, and preventing cell death. Low glutathione levels are consistently found in Quantitative real time imaging of glutathione Nature Communications Real Time Monitoring of Glutathione in Living Cells Reveals that High Glutathione Levels Are Required to Maintain Stem Cell Function: Stem Cell Reports