For laboratory research use only.
Glutathione is the tripeptide γ-glutamyl-cysteinyl-glycine and the principal low-molecular-weight thiol buffer in most animal cells. Few research reagents are as simultaneously ordinary and indispensable.
Redox chemistry
Reduced glutathione (GSH) provides a nucleophilic thiol; oxidized glutathione (GSSG) is the disulfide. Meister’s classic reviews summarize biosynthesis via γ-glutamylcysteine synthetase and glutathione synthetase, peroxidase/reductase cycles, and conjugation pathways that dispose of electrophiles (Meister, Glutathione; glutathione metabolism). The glutathione–ascorbate axis is a related antioxidant network in animals (glutathione-ascorbic acid system).
How laboratories use it
GSH and GSSG appear as standards, enzymatic substrates, and redox-state reporters. Assay kits that report “total glutathione” without a reduced/oxidized split answer a different question than GSH/GSSG ratio methods. Notebooks should state which form was used.
Related but distinct reagents
N-acetylcysteine, cysteine, and enzyme cofactors in redox kits intersect glutathione metabolism without being glutathione. Consumer narratives about “boosting glutathione” are a different genre from reagent identity and are out of scope here.
Limits
Biochemical centrality is not a clinical claim for a research listing. Confirm whether a lot is GSH, a salt, GSSG, or a mixture before comparing to a methods paper.
Sources
- Glutathione. (Annu Rev Biochem, 1983, PMID 6137189)
- Glutathione metabolism. (Methods Enzymol, 1995, PMID 7651209)
- Glutathione-ascorbic acid antioxidant system in animals. (J Biol Chem, 1994, PMID 8144521)