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 Pathways Electrochemiluminescence detection of reduced and oxidized glutathione ratio by quantum dot layered double hydroxide film Analyst (RSC Publishing) Oxidized Glutathione (GSSG) ELISA Kit, Cat#EKU11585 Biomatik Glutathione For Autoimmune Disease How To Make More Of It Dr. Hagmeyer Dr Hagmeyer A black hole for oxidized glutathione Nature Chemical Biology