Ratio of reduced glutathione to oxidized glutathione (GSH GSSG). Data Download Scientific Diagram File:Glutathione Reductase and Peroxidase Graphic.jpg Wikimedia Commons The effectiveness of compound X is oftentimes dependent on the presence of compounds Y and Z and so on. Endogenous compounds like glutathione get a lot of commercial attention but they do Glutathione adducts induced by ischemia and deletion of glutaredoxin 1 stabilize HIF 1 and improve limb revascularization PNAS Glutathione Related Enzyme System: Glutathione Reductase (GR), Glutathione Transferases (GSTs) and Glutathione Peroxidases (GPXs) Springer Nature Link