What Is Glutathione?
Glutathione (GSH) is a tripeptide (γ-glutamyl-cysteinyl-glycine) and the most abundant intracellular antioxidant in the human body. Every cell produces it, but concentrations are highest in the liver — reflecting its central role in detoxification, heavy metal chelation, and phase II metabolic conjugation. Glutathione levels decline with age, disease, and chronic stress — a decline increasingly recognized as a contributor to aging-associated oxidative tissue damage and immune dysfunction.
Antioxidant Mechanisms
Glutathione protects cells through direct scavenging of reactive oxygen species, enzymatic antioxidant function as the cofactor for glutathione peroxidases, and regeneration of other antioxidants including vitamins C and E from their oxidized forms. The glutathione/oxidized glutathione (GSSG) ratio serves as a key indicator of cellular redox status.
Detoxification and Immune Applications
In the liver, glutathione conjugates electrophilic toxins — including acetaminophen metabolites, environmental toxins, and carcinogens — rendering them water-soluble for excretion. Glutathione is also required for optimal lymphocyte proliferation and natural killer cell cytotoxicity. Its decline with age contributes to immunosenescence, and restoration of glutathione levels has been shown in multiple studies to improve immune parameters in elderly subjects.
Quick Reference
Member reference tables summarize the compound's research parameters.
Research Indications
Research Protocols
As reported in cited literature and research-community logs (see Research Citations below), not a personal dosing recommendation.
This member section describes parameters reported in the research literature.
Reported Research Time Points
This member section summarizes reported research time points.
Safety Notes
Included for harm-reduction awareness only, in the event this compound is encountered outside its labeled research use. Inclusion here does not imply RUO Codes endorses, recommends, or instructs human use.
This member section discusses research safety considerations and uncertainties.
Peptide Interactions
This member section summarizes reported compound interactions and evidence limitations.
Quality Indicators
Research Citations
- High-dose intravenous glutathione in man: Pharmacokinetics and effects on cyst(e)ine in plasma and urine
Aebi, S., Assereto, R., Lauterburg, B.H., 1991, European Journal of Clinical Investigation - Alterations in glutathione levels in Parkinson's disease and other neurodegenerative disorders affecting basal ganglia
Sian, J., Dexter, D.T., Lees, A.J., et al., 1994, Annals of Neurology - Phase IIb Study of Intranasal Glutathione in Parkinson's Disease
Mischley, L.K., Lau, R.C., Shankland, E.G., Wilbur, T.K., Padowski, J.M., 2017, Journal of Parkinson's Disease - Glutathione and immune function
Droge, W., & Breitkreutz, R., 2000, Proceedings of the Nutrition Society - Glutathione synthesis
Lu, S.C., 2013, Biochimica et Biophysica Acta - Glutathione-responsive self-assembling peptide-coated Salmonella for antitumor therapy
Shen J, Zhu Y, Li T, 2026, J Control Release - Peptide AEDL and Glutathione Stimulates Root Development Nicotiana tabacum
Kononenko NV, Fedoreyeva LI, 2024, Int J Mol Sci - Improved efficacy of linear glutathione-peptide chaperon complexes on melanogenesis inhibition and transdermal delivery
Zheng J, Ma Q, Haider A, 2024, Bioorg Chem - Intracellular Restructured Reduced Glutathione-Responsive Peptide Nanofibers for Synergetic Tumor Chemotherapy
Guo WW, Zhang ZT, Wei Q, 2020, Biomacromolecules - Degradation of glutathione and glutathione conjugates in plants
Ito T, Ohkama-Ohtsu N, 2023, J Exp Bot