If you have been reading about Glutathione and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-06-04. Where a claim depends on a specific study, the study is described rather than over-claimed.
Cells synthesize glutathione through two ATP-dependent enzymatic steps. The first step combines glutamate and cysteine to form gamma-glutamylcysteine, catalyzed by glutamate-cysteine ligase. The second step adds glycine, producing the complete tripeptide, catalyzed by glutathione synthetase. Glutathione itself can inhibit the first enzyme, providing negative feedback when levels are high. Because cysteine is often limiting, its availability influences how quickly the pathway proceeds. These reactions occur in the cytosol, and the resulting glutathione can be distributed to other compartments.
Glutathione functions in redox balance, detoxification, and sulfur amino acid storage. It participates in reactions that help maintain ascorbate and protein thiol status. The molecule serves as a cofactor for several enzymes, including glutathione peroxidases and glutathione S-transferases. These enzymes reduce peroxides and conjugate electrophiles, respectively. Glutathione also contributes to the metabolism of xenobiotics and to the transport of cysteine between tissues. How interorgan transport and tissue-specific regulation shape whole-body pools remains an active area of study.
Because GSH is central to redox balance, its status is studied in aging, liver disease, neurodegenerative conditions, and metabolic disorders. Observational studies often report lower GSH or higher GSSG in affected tissues, but such associations do not establish that raising glutathione changes disease outcomes. Oral glutathione is digested into amino acids, and whether intact absorption occurs remains debated; precursors such as N-acetylcysteine and cysteine donors are also investigated. Regulatory agencies generally treat glutathione as a dietary supplement, not an approved drug, and clinical claims require evidence from controlled trials.
Glutathione is a small tripeptide composed of glutamate, cysteine, and glycine, with the unusual gamma-glutamyl linkage between glutamate and cysteine. Its cysteine thiol group makes it a major non-enzymatic antioxidant in cells. The reduced form, GSH, predominates in most intracellular compartments, while the oxidized disulfide form, GSSG, is produced when GSH reduces reactive oxygen species. Intracellular concentrations often reach millimolar levels, whereas plasma concentrations are much lower, typically in the low micromolar range. This gradient reflects active synthesis, transport, and consumption rather than passive distribution.
Synthesis occurs in two ATP-dependent steps: glutamate-cysteine ligase joins glutamate and cysteine to form gamma-glutamylcysteine, and glutathione synthetase adds glycine to complete the tripeptide. The pathway is feedback-inhibited by GSH and limited by cysteine availability, so cysteine supply often constrains production. Once formed, GSH participates in redox buffering, xenobiotic conjugation, and protein glutathionylation. Glutathione peroxidase uses GSH to reduce hydrogen peroxide and lipid peroxides, yielding GSSG, while glutathione reductase regenerates GSH using NADPH. Glutathione S-transferases conjugate electrophiles to GSH, supporting detoxification and excretion.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C10H17N3O6S | Reduced glutathione (GSH) |
| Molar mass | 307.32 g/mol | Calculated for C10H17N3O6S |
| Appearance | White to off-white powder | Typical solid form |
| Solubility | Water-soluble | Polar tripeptide |
| Common synonyms | GSH; L-glutathione | Gamma-glutamylcysteinylglycine |
In its reduced form, glutathione carries a sulfhydryl group that can donate electrons. This property lets it act as a major cellular antioxidant and redox buffer. Glutathione peroxidase uses it to reduce hydrogen peroxide and lipid peroxides, while glutathione reductase regenerates the reduced form using NADPH. The ratio of reduced glutathione to glutathione disulfide is widely used as an indicator of oxidative stress, though the ratio changes with compartment, cell type, and sample handling. Oxidized glutathione can also form mixed disulfides with proteins, affecting their activity.
Glutathione supports detoxification by conjugating reactive electrophiles through glutathione S-transferases. The resulting conjugates are processed and exported, often after further metabolism. It also stores cysteine, transports amino acids across membranes through the gamma-glutamyl cycle, and assists in the maturation of iron-sulfur clusters and some prostaglandins. In plants, animals, and many microbes, the molecule appears in similar roles, but concentrations vary enormously between tissues. Liver, kidney, and red blood cells tend to contain high amounts, while blood plasma contains much less.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. It contains an unusual gamma-glutamyl bond between glutamate and cysteine, which resists cleavage by many peptidases. The reduced form, GSH, carries a thiol group on cysteine and is the dominant intracellular form in most cells. Its structure allows it to participate in redox reactions and to serve as a sulfur donor. The oxidized form, GSSG, consists of two GSH molecules joined by a disulfide bond.
In cells, glutathione helps maintain the reducing environment of the cytosol and supports enzymes that counteract reactive oxygen species. It acts as a cofactor for glutathione peroxidases, which reduce hydrogen peroxide and lipid peroxides, and for glutathione S-transferases, which conjugate electrophiles. The ratio of GSH to GSSG is often used as an indicator of oxidative stress, although the ratio can vary by compartment and cell type. Glutathione also stores cysteine, an amino acid that can be limiting for protein synthesis and antioxidant defense.
primary transcript The unprocessed, single-stranded RNA molecule produced by the transcription of a DNA sequence as it exists before post-transcriptional modifications such as alternative splicing convert it into a mature RNA product such as an mRNA, tRNA, or rRNA. A precursor mRNA or pre-mRNA, for example, is a primary transcript which, after processing, becomes a mature mRNA ready for translation.
Tyrosine or its precursor N-acetyl-L-tyrosine are commonly used to purportedly boost levels of dopamine and noradrenaline. Some brands may contain L-dopa (generally as Mucuna pruriens extract), but this is classified as a prescription medicine in many countries. Theanine is often used as an ingredient (sometimes as "green tea extract", though this may alternatively be used to refer to EGCG, which may also be present), to supposedly improve mental and physical performance, and reduce anxiety. Piperine (often as "black pepper extract") is often included possibly to improve absorption of other ingredients, and for its supposed ability to improve muscle recovery. B vitamins are another common ingredient, most commonly vitamin B3 and vitamin B12 in various forms, but also often thiamine (sometimes as sulbutiamine), pantothenic acid (vitamin B5) and folic acid. Carnitine or its precursor acetylcarnitine are sometimes added to the mix for their supposed ability to enhance exercise performance and aid recovery, though evidence for these benefits is weak. Betaine (trimethylglycine) is often used as an ingredient, despite limited evidence for effectiveness in increasing athletic performance. Phenethylamines such as β-phenethylamine, β-methylphenethylamine, deterenol, halostachine, N-methyltyramine, hordenine, or synephrine (sometimes as "bitter orange extract") may be included as thermogenics to aid in weight loss. Higenamine (norcoclaurine) is also often added for its supposed weight loss and mild stimulant properties.
Still, the index closed at its all-time high of 24,121.74, for its first close above 24,000 points. The SENSEX closed at 25,019.51, for its first close above the 25,000 milestone on 5 June 2014 26,000, 7 July 2014- The SENSEX crossed record 26,000 level for the first time on 7 July 2014 and reached its peak of 26,123.55, before closing slightly lower at 26,100.08, in anticipation of strong reformatory budget by the new government. 27,000, 2 September 2014 - The SENSEX closed at 27,019.39, for its first close above the 27,000 level, on 2 September 2014. This is the sixth 1000-point milestone the index has crossed in 2014, tying a record set in 2007. 28,000, 5 November 2014 - The SENSEX crossed 28,000 mark, on 5 November 2014. One week later, on 12 November 2014, the index would close above the milestone for the first time. This is the seventh 1000-point milestone the index has crossed in 2014, breaking the six 1000-point record set in 2007. 29,000, 23 January 2015 - BSE Sensex today set a new high of 29,408 points and all-time closing high of 29,278.84, up 272.82 points 30,000, 4 March 2015 - The Sensex breaches 30000 mark following steps taken by the Reserve Bank of India in cutting the repo rates. 26 April 2017 - The SENSEX closed at 30,133.35, for its first close above the 30,000 level. 31,000, 26 May 2017- The SENSEX crossed record 31,000 level for the first time on 26 May 2017 and reached its peak of 31,074.07, before closing slightly lower at 31,028.21. 32,000, 13 July 2017 - The SENSEX closed at 32,037.38, for its first close above the 32,000 level, on 13 July 2017.
Sulfur deposits in Sicily were the dominant source for more than a century. By the late 18th century, about 2,000 tonnes per year of sulfur were imported into Marseille, France, for the production of sulfuric acid for use in the Leblanc process. In industrializing Britain, with the repeal of tariffs on salt in 1824, demand for sulfur from Sicily surged. The increasing British control and exploitation of the mining, refining, and transportation of sulfur, coupled with the failure of this lucrative export to transform Sicily's backward and impoverished economy, led to the Sulfur Crisis of 1840, when King Ferdinand II gave a monopoly of the sulfur industry to a French firm, violating an earlier 1816 trade agreement with Britain. A peaceful solution was eventually negotiated by France. In 1867, elemental sulfur was discovered in underground deposits in Louisiana and Texas. The highly successful Frasch process was developed to extract this resource, and the United States replaced Sicily as the main producer of sulfur worldwide in the early 20th century. Since the advent of the contact process, the majority of sulfur is used to make sulfuric acid for a wide range of uses, particularly fertilizer. In recent times, the main source of sulfur has become petroleum and natural gas. This is due to the requirement to remove sulfur from fuels in order to prevent acid rain, and has resulted in a surplus of sulfur.
The Pentagon was extensively damaged, causing one section of the building's E ring to collapse. The plane hit the Pentagon at the first-floor level. The front part of the fuselage disintegrated on impact; debris from the tail section penetrated the furthest into the building, breaking through 310 feet (94 m) of the three outermost of the building's five rings.
Sources: en.wikipedia.org
== Occurrence in beverages and food == The widespread presence of ethyl carbamate in alcoholic beverages was discovered during the mid-1980s. To raise public awareness of this issue, the U.S. Center for Science in the Public Interest published, in 1987, Tainted Booze: The Consumer's Guide to Urethane in Alcoholic Beverages. Studies have shown that most, if not all, yeast-fermented alcoholic beverages contain traces of ethyl carbamate (15 ppb to 12 ppm). Other foods and beverages prepared by means of fermentation also contain ethyl carbamate. For example, bread has been found to contain 2 ppb; as much as 20 ppb has been found in some samples of soy sauce. Amounts of both ethyl carbamate and methyl carbamate have also been found in wines, sake, beer, brandy, whiskey and other fermented alcoholic beverages. It has been shown that ethyl carbamate forms from the reaction of ethanol with urea:
Alcohol dehydrogenases (ADH) (EC 1.1.1.1) are a group of dehydrogenase enzymes that occur in many organisms and facilitate the interconversion between alcohols and aldehydes or ketones with the reduction of nicotinamide adenine dinucleotide (NAD+) to NADH. In humans and many other animals, they serve to break down alcohols that are otherwise toxic, and they also participate in the generation of useful aldehyde, ketone, or alcohol groups during the biosynthesis of various metabolites. In yeast, plants, and many bacteria, some alcohol dehydrogenases catalyze the opposite reaction as part of fermentation to ensure a constant supply of NAD+.
=== Proteomics === Screens for biologically relevant protein-protein interactions have been performed using Tandem Affinity Purification (TAP) with the SBP-Tag and Protein A, for interaction proteomics and transcription factor complexes with the SBP-Tag and Protein G, for proteins that interact with the Dengue Virus protein DENV-2 NS4A with the SBP-Tag and the Calmodulin Tag. and for proteins that interact with protein phosphatase 2A (PP2A) with the SBP-Tag and the hemagglutinin (HA)-tag.
Cure T1D by restoring the body’s ability to produce insulin and stopping T1D before it occurs or providing insulin independence through replacement with insulin-producing cells. Improve lives by minimizing the effects of T1D as much as possible until new T1D resources, technologies, and therapies are discovered. Breakthrough T1D prioritizes four strategic research areas; autoimmune therapies, cell therapies, prevention of complications, and glucose control.
Sources: en.wikipedia.org
Glutathione is built from three amino acids: glutamate, cysteine, and glycine. The linkage involves the gamma-carboxyl group of glutamate rather than the alpha-carboxyl group, which is unusual for peptides. This structure protects the bond from some common peptidases.
It is present in nearly all cells, with notable amounts in the liver, kidneys, and red blood cells. The highest intracellular concentrations are usually in the millimolar range. Levels differ by tissue, age, and physiological state.
It is not classified as an essential nutrient because cells can synthesize it from amino acids. Dietary sources exist, but their contribution to tissue pools is not fully established. The body's production depends on enzyme activity and precursor availability.
GSH is the reduced, thiol-containing form of glutathione, while GSSG is the oxidized disulfide dimer formed when two GSH molecules react. Cells maintain a high GSH-to-GSSG ratio under normal conditions. A shift toward GSSG is often interpreted as oxidative stress, though sample handling can affect the measured ratio.