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Human-limitedMaster antioxidant for detox and cellular defense

Glutathione

Also indexed as GSH, Gamma-L-Glutamyl-L-cysteinylglycine, Reduced Glutathione

Glutathione is a tripeptide antioxidant composed of glutamate, cysteine, and glycine that is naturally synthesized in virtually every cell of the body. It serves as the body's master antioxidant, neutralizing reactive oxygen species, supporting detoxification pathways, and maintaining redox homeostasis. Declining glutathione levels are associated with aging, chronic disease, and oxidative stress-related conditions.

Overview

Parenterally administered glutathione bypasses gastrointestinal degradation by gamma-glutamyltranspeptidase (GGT) and enters systemic circulation intact. Cellular uptake occurs via multidrug resistance-associated protein (MRP) transporters and organic anion transporters. Hepatocytes accumulate GSH for conjugation reactions in the smooth endoplasmic reticulum and mitochondria. Exogenous GSH also modulates lymphocyte function: it supports Th1 polarization, enhances natural killer (NK) cell cytotoxicity, and promotes dendritic cell antigen presentation. In melanocytes, GSH inhibits tyrosinase activity both by direct copper chelation at the enzyme's active site and by shifting DOPA oxidation toward phaeomelanin (lighter pigment) rather than eumelanin.

Proposed mechanism

Glutathione exerts its antioxidant effects primarily by donating electrons to neutralize free radicals and reactive oxygen species, becoming oxidized glutathione (GSSG) in the process, which is then recycled back to its reduced active form (GSH) by glutathione reductase using NADPH. It is an essential cofactor for glutathione peroxidase enzymes that detoxify lipid peroxides and hydrogen peroxide, and it conjugates with electrophilic toxins via glutathione S-transferases in the liver to facilitate their excretion. Glutathione also plays a critical role in maintaining the thiol redox state of proteins, modulating immune cell function, and supporting mitochondrial integrity.

What the evidence supports

Human data exists but the trials are small, short-term, or not yet replicated.

Graded Human-limited

Human data that exists but is thin: open-label work, single-arm studies, small cohorts, or observational follow-up without randomisation.

Key citations

Representative primary sources, including results that did not favour the compound.

  1. [1]

    Glutathione: overview of its protective roles, measurement, and biosynthesis

    · Molecular Aspects of Medicine. doi:10.1016/j.mam.2008.08.006 · 2009

  2. [2]

    Effect of oral glutathione supplementation on body stores of glutathione

    · European Journal of Nutrition. doi:10.1007/s00394-014-0706-z · 2015

  3. [3]

    Glutathione and its antiaging and antimelanogenic effects

    · Clinical, Cosmetic and Investigational Dermatology. doi:10.2147/CCID.S128999 · 2017

  4. [4]

    Intravenous glutathione in the treatment of early Parkinson's disease

    · Progress in Neuro-Psychopharmacology and Biological Psychiatry. doi:10.1016/S0278-5846(96)00084-2 · 1996

Citation records in this build are illustrative placeholders for the design.

Reference information for research purposes. Not medical advice, and not a recommendation to use any compound. Many entries describe substances that are not approved for human use.

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