GSH raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2026-01-28 and is reviewed periodically as new material appears.
Functionally, glutathione supports redox balance by donating electrons and becoming oxidized. It also serves as a cofactor for enzymes such as glutathione peroxidases and glutathione S-transferases. These enzymes participate in peroxide reduction and in conjugation reactions that help process reactive molecules. Separate from antioxidant roles, glutathione can modify protein cysteines through S-glutathionylation, influencing enzyme activity and signaling. Research continues to examine how these chemical roles translate into whole-organism effects.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. Its glutamate-cysteine linkage uses the gamma-carboxyl group of glutamate, a feature that resists standard peptidases. The cysteine residue provides a thiol group, which gives the molecule its reducing character. In cells, glutathione is often the most abundant small-molecule thiol, with concentrations varying widely by tissue and compartment. It exists mainly in a reduced form called GSH, while oxidation produces a disulfide-linked dimer called GSSG.
Biosynthesis proceeds in two ATP-dependent steps. First, glutamate-cysteine ligase joins glutamate and cysteine. Second, glutathione synthetase adds glycine to the intermediate. The pathway is regulated by cysteine availability, enzyme expression, and feedback inhibition by glutathione itself. Liver tissue has a particularly high capacity for synthesis and export. Because the molecule is made inside cells, circulating glutathione reflects a balance of release, uptake, and breakdown rather than simple dietary supply.
Glutathione is present in most tissues, with especially high concentrations in the liver. It also serves as a cofactor for some enzymes and helps transport amino acids across cell membranes. In plants and microorganisms, glutathione contributes to stress responses and metal handling. The molecule is synthesized in two ATP-dependent steps, first producing gamma-glutamylcysteine and then adding glycine. Because cysteine availability often limits synthesis, dietary and metabolic factors can influence glutathione levels. Research continues to examine how these levels relate to health and disease.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. The peptide bond between glutamate and cysteine uses the gamma-carboxyl group of glutamate rather than the alpha-carboxyl group. This unusual linkage protects the molecule from many common peptidases. The cysteine side chain carries a thiol group that can undergo reversible oxidation. Because of this thiol, glutathione participates in redox reactions and helps maintain the reducing environment inside most cells in living systems.
| Property | Value | Notes |
|---|---|---|
| Common name | Glutathione (reduced form) | Often abbreviated GSH |
| Chemical class | Tripeptide | Contains glutamate, cysteine, and glycine |
| Molecular formula | C10H17N3O6S | Refers to the reduced form |
| Molar mass | 307.32 g/mol | Calculated for C10H17N3O6S |
| Appearance | White to off-white powder | Typical laboratory-grade solid |
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.
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. The enzyme glutamate-cysteine ligase joins glutamate and cysteine to form gamma-glutamylcysteine, and glutathione synthetase adds glycine. The first step is rate-limiting and is influenced by cysteine availability and feedback inhibition by GSH. Breakdown involves gamma-glutamyl transferase and subsequent peptidases, which release constituent amino acids for reuse. Because turnover differs among tissues, measurements from blood, plasma, and tissues are not directly interchangeable. Research continues to clarify how compartment-specific pools are regulated in health and disease.
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.
== June 28, 1915 (Monday) == British cargo ship Armenian was torpedoed and sunk in the Atlantic Ocean by German ship SM U-24 with the loss of 29 crew. Survivors were rescued by a Belgian cargo ship. Battle of Gully Ravine — British forces attacked and captured key defense positions from the Ottoman Empire in Gallipoli that advanced the left flank of the British line closest to the Aegean Sea. Rapid snow melt in the Rockies and heavy rain caused the North Saskatchewan River to overflow in Alberta. River levels in Edmonton were reported to be rising over 10 feet. In the order to prevent the Low Level Bridge — the only available crossing over the river at the time — from being broken apart by river debris, Canadian Northern Railway parked several train cars on the bridge to bolster its weight. Some housing and several lumber mills in the river valley were swept away by the flooding. Died: Guillermo Billinghurst, 63, Peruvian state leader, third President of Peru (b. 1851) Victor Trumper, 37, Australian cricketer, batsman for the Australia national cricket team from 1898 to 1912 and the New South Wales cricket team from 1894 to 1914; died of Bright's disease (b. 1877) Charles Spagnoletti, 82, British engineer, first superintendent for the Great Western Railway telegraph; died of pneumonia (b. 1832)
strand An individual chain of nucleotides comprising a nucleic acid polymer, existing either independently (in which case the nucleic acid molecule is said to be single-stranded) or base-paired in a duplex with another, separate strand (in which case it is said to be double-stranded).
== Inhibition of glycolytic pathway == The impairment of glucose metabolism by fatty acid oxidation is mediated by the short-term inhibition of several glycolytic processes. The extent of inhibition increases along the glycolytic pathway, being most severe at the level of pyruvate dehydrogenase and less severe at the level of glucose uptake and 6-phosphofructo-1-kinase (PFK-1). This sequence occurs because of the initial event, triggered by fatty acid oxidation, is an increase in the mitochondrial ratios of [acetyl-CoA]/[CoA] and [NADH]/[NAD+]. These both serve to inhibit pyruvate dehydrogenase activity. It has been proposed that these changes lead to an accumulation of cytosolic citrate, which in turn inhibits PFK-1, followed by an increase in glucose 6-phosphate, which eventually inhibits hexokinase.
Only some of the Ruthenian szlachta of the Chernigov region, who had their origins in the Moscow state, saved their lands from division among Cossacks and became part of the Cossack szlachta. After this, the Ruthenian szlachta refrained from plans to have a Moscow Tsar as king of the Commonwealth, its own Michał Korybut Wiśniowiecki later becoming king. The last, ultimately unsuccessful, attempt to rebuild the Polish–Cossack alliance and create a Polish–Lithuanian–Ruthenian Commonwealth was the 1658 Treaty of Hadiach. The treaty was approved by the Polish king and the Sejm, and by some of the Cossack starshyna, including hetman Ivan Vyhovsky. The treaty failed, however, because the starshyna were divided on the issue, and it had even less support among rank-and-file Cossacks.
== Clinical Significance == Deficiencies in any of the enzymes in the catabolism of phenylalanine and tyrosine, like GSTZ1, has led to diseases such as alkaptonuria, phenylketonuria, and several forms of tyrosinemia. A lack of GSTZ1, specifically, leads to the amalgamation of maleylacetoacetate and succinylacetone which has been observed to cause oxidative stress. Also, scarcities have been seen to alter the metabolism of certain drugs and xenobiotics in mice. Most importantly, researchers have successfully genetically engineered GSTZ1 to mimic one of the most significant antioxidant enzymes, glutathione peroxidase (GPX). GPX is most known for its role to protect cells and tissues against oxidative damage by catalyzing the reduction of hydroperoxides using GSH as a reducing substrate and blocking the radical reaction caused by lipid peroxides. By protecting against this oxidative damage, GPX essentially prevents against degenerative diseases such as atherosclerosis, myocardial ischemia, heart failure, diabetes, pulmonary fibrosis, neurodegenerative disorders, and Alzheimer's disease. However, because of GPX's poor stability and paucity, it cannot be used in clinical studies and other methods must be considered. The newfound seleno-hGSTZ1–1 (or the engineered GSTZ1 enzyme) has a high GPX activity and a very similar reaction mechanism to that of GPX.
Sources: en.wikipedia.org
Chemotherapy, American Cancer Society Hazardous Drug Exposures in Health Care, National Institute for Occupational Safety and Health NIOSH List of Antineoplastic and Other Hazardous Drugs in Healthcare Settings, 2016, National Institute for Occupational Safety and Health International Ototoxicity Management Group (IOMG) - Wikiversity
=== Vacuum system === The specimen should be in a high-vacuum environment for optimal milling results. The vacuum makes sure that there are few air particles that could interfere with the ion beam. This way, all the energy in the energy beam can be transferred to the surface with much less energy loss.
Nicergoline is an ergot alkaloid derivative that acts as a potent and selective α1A-adrenergic receptor antagonist. The IC50 of nicergoline in vitro has been reported to be 0.2 nM. The primary action of nicergoline is to increase arterial blood flow by vasodilation. Furthermore, it is known that nicergoline inhibits platelet aggregation. Studies have shown that nicergoline also increases nerve growth factor in the aged brain. In addition to the α1A-adrenergic receptor, nicergoline is an antagonist of the serotonin 5-HT1A receptor (IC50 = 6 nM) and shows moderate affinity for serotonin 5-HT2 and α2-adrenergic receptors and low affinity for the dopamine D1 and D2 and muscarinic acetylcholine M1 and M2 receptors.
21 May The WHO informs about the international 2022 monkeypox outbreak in non-endemic countries – an unprecedented number of cases detected outside of Africa after the first of these cases was detected on 6 May. On 24 May, the WHO states that the outbreak can be contained. The main method used for the early containment is 'ring vaccination' – vaccinating close contacts of positive cases via existing vaccines. 23 May Researchers report that CRISPR-Cas9 gene editing has been used to boost vitamin D in tomatoes. A study shows why decarbonization must be accompanied by strategies to reduce the levels of short-lived climate pollutants with near-term effects for climate goals. 24 May Scientists report the first 3D-printed lab-grown wood. It is unclear if it could ever be used on a commercial scale (e.g. with sufficient production efficiency and quality). A CDC study based on electronic health records shows that "one in five COVID-19 survivors aged 18–64 years and one in four survivors aged ≥65 years experienced at least one incident condition that might be attributable to previous COVID-19" or long COVID. On 18 May, an analysis of private healthcare claims shows that of 78,252 patients diagnosed with 'long COVID', 75.8% had not been hospitalized for COVID-19. 25 May – The world's smallest remote-controlled walking robot, measuring just half a millimetre wide, is demonstrated. Potential applications include the clearing of blocked arteries.
Sources: en.wikipedia.org
Apollo 11 left lunar orbit and returned to Earth, landing safely in the Pacific Ocean on July 24, 1969. When the spacecraft splashed down, 2,982 days had passed since Kennedy's commitment to landing a man on the Moon and returning him safely to the Earth before the end of the decade; the mission was completed with 161 days to spare. With the safe completion of the Apollo 11 mission, the Americans won the race to the Moon. Armstrong and his crew became worldwide celebrities, feted with ticker-tape parades on August 13 in New York City and Chicago, attended by an estimated six million. That evening in Los Angeles they were honored at an official state dinner attended by members of Congress, 44 governors, the Chief Justice of the United States, and ambassadors from 83 nations. The President and Vice president presented each astronaut with the Presidential Medal of Freedom. The astronauts spoke before a joint session of Congress on September 16, 1969. This began a 38-day world tour to 22 foreign countries and included visits with the leaders of many countries. The public's reaction in the Soviet Union was mixed. The Soviet government limited the release of information about the lunar landing, which affected the reaction. A portion of the populace did not give it any attention, and another portion was angered by it. The first landing was followed by another, precision landing on Apollo 12 in November 1969, within walking distance of the Surveyor 3 spacecraft which landed on April 20, 1967.
A honey bee that is away from the hive foraging for nectar or pollen will rarely sting, except when stepped on or roughly handled. Honey bees will actively seek out and sting when they perceive the hive to be threatened, often being alerted to this by the release of attack pheromones (below). Although it is widely believed that a worker honey bee can sting only once, this is only partially true: although the stinger is in fact barbed so that it lodges in the victim's skin, tearing loose from the bee's abdomen and leading to its death in minutes, this only happens if the skin of the victim is sufficiently thick, such as a mammal's. Honey bees are the only hymenoptera with a strongly barbed sting, though yellow jackets and some other wasps have small barbs. The venom of the honeybee contains histamine, mast cell degranulating peptide, melittin, phospholipase A2, hyaluronidase and acid phosphatase. The three proteins in honeybee venom that are important allergens are phospholipase A2, hyaluronidase and acid phosphatase. In addition, the polypeptide melittin is also antigenic. Bumblebee venom appears to be chemically and antigenically related to honeybee venom. Bees with barbed stingers can often sting other insects without harming themselves. Queen honeybees and bees of many other species, including bumblebees and many solitary bees, have smoother stingers with smaller barbs and can sting mammals repeatedly. The sting's injection of apitoxin into the victim is accompanied by the release of alarm pheromones, a process which is accelerated if the bee is fatally injured.
Melamine Materials Safety Data Sheet (MSDS) OECD Screening Information Data Set (SIDS): Melamine (High Production Volume Chemicals Screening Information，PDF, 89 pages). FDA Web Page with Information on Pet Food Recall (due to Melamine contamination) European Commission decision (2008/798/EC) imposing special conditions governing the import of products containing milk or milk products originating from China Statement on melamine from the International Fertilizer Industry Association Toxicological and Health Aspects of Melamine and Cyanuric Acid: Report of a WHO Expert Meeting In collaboration with FAO Melmac Central's History on Melamine .
Saffron likely originated in Iran, Greece, Mesopotamia, or Kashmir. Harold McGee states that it was domesticated in or near Greece during the Bronze Age. C. sativus is probably a triploid form of Crocus cartwrightianus, which is also known as "wild saffron". Saffron crocus was slowly propagated by humans throughout much of Eurasia and was later brought to parts of North Africa, North America, and Oceania. Several wild species of Crocus similar to the commercial plant are known to have been harvested in recent times for use as saffron. Crocus ancyrensis was used to make saffron in Sivas in Central Turkey, the corms were also eaten. Crocus cartwrightianus was harvested on Andros in the islands of the Cyclades, for medicinal purposes and the stigmas for making a pigment called Zafran. Crocus longiflorus stigmas were used for saffron in Sicily. Crocus thomasii stigmas were used to flavour dishes around Taranto, South Italy. In Syria the stigmas of an unknown wild species were collected by women and children, sun-dried and pressed into small tablets which were sold in the Bazaars. Not all ancient depictions or descriptions of saffron spice or flowers are certain to be the same species as the modern commercial species used for spice.
=== Plasma or whole blood === In this article, all values (except the ones listed below) denote blood plasma concentration, which is approximately 60–100% larger than the actual blood concentration if the amount inside red blood cells (RBCs) is negligible. The precise factor depends on hematocrit as well as amount inside RBCs. Exceptions are mainly those values that denote total blood concentration, and in this article they are:
Sources: en.wikipedia.org
Glutathione is a sulfur-containing tripeptide made from glutamate, cysteine, and glycine. It is found in most cells and participates in redox balance and detoxification reactions.
No. It is a tripeptide assembled from three amino acids. The term amino acid applies to the individual building blocks, not to the assembled molecule.
It is present in many tissues, with especially high amounts in liver. Intracellular concentrations are generally much higher than those found in blood plasma.
Glutathione is a tripeptide made from glutamate, cysteine, and glycine. Its cysteine residue provides a thiol group that is central to its redox activity. The glutamate-cysteine bond forms through the gamma-carboxyl group of glutamate.