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 Anionic heptamethine cyanine as reactive sulfur species activated probe: Application of NIR II fluorescence imaging for in vivo visualization of glutathione ScienceDirect l Cysteine Glutathione Mixed Disulfide, a Novel Bioavailable Sulfhydryl Modified Glutathione Precursor, Protects against Early Liver Injury Induced by Short Term Hypercholesterolemia Chemical Research in Toxicology Critical Roles of the CysteineGlutathione Axis in the Production of Glutamyl Peptides in the Nervous System