thiol is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2026-08-01. Where a claim depends on a specific study, the study is described rather than over-claimed.
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 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 small tripeptide built from glutamate, cysteine, and glycine. The peptide bond between glutamate and cysteine uses the gamma-carboxyl group, a linkage that resists ordinary peptidases. Cells make it in two ATP-dependent steps: gamma-glutamylcysteine synthetase joins glutamate and cysteine, then glutathione synthetase adds glycine. The pathway is feedback-inhibited by glutathione itself, so intracellular levels tend to stay within a narrow range. Because cysteine is often limiting, sulfur amino acid supply influences how much glutathione a cell can produce.
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.
| 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 |
At the end of its ten-year license, BMS re-formulated Videx as Videx EC and patented that, which reformulation the FDA approved in 2000. The new formulation is a smaller capsule containing coated microspheres instead of using a buffering compound. It is approved by the FDA for once-a-day dosing. Also at the end of that ten-year period, the NIH licensed didanosine to Barr Laboratories under a non-exclusive license, and didanosine became the first generic anti-HIV drug marketed in the United States. One of the patents for ddI expired in the United States on 29 August 2006, but other patents extend beyond that time.
A few incidents have occurred when radioactive material was disposed of improperly, shielding during transport was defective, or when it was simply abandoned or even stolen from a waste store. In the Soviet Union, waste stored in Lake Karachay was blown over the area during a dust storm after the lake had partly dried out. In Italy, several radioactive waste deposits let material flow into river water, thus contaminating water for domestic use. In France in the summer of 2008, numerous incidents happened: in one, at the Areva plant in Tricastin, it was reported that, during a draining operation, liquid containing untreated uranium overflowed out of a faulty tank and about 75 kg of the radioactive material seeped into the ground and, from there, into two rivers nearby; in another case, over 100 staff were contaminated with low doses of radiation. There are ongoing concerns around the deterioration of the nuclear waste site on the Enewetak Atoll of the Marshall Islands and a potential radioactive spill. Scavenging of abandoned radioactive material has been the cause of several other cases of radiation exposure, mostly in developing nations, which may have less regulation of dangerous substances (and sometimes less general education about radioactivity and its hazards) and a market for scavenged goods and scrap metal. The scavengers and those who buy the material are almost always unaware that the material is radioactive and it is selected for its aesthetics or scrap value.
Dylan Thomas was born on 27 October 1914 in Swansea, the son of Florence Hannah (née Williams; 1882–1958), a seamstress, and David John 'Jack' Thomas (1876–1952), a teacher. His father had a first-class honours degree in English from University College, Aberystwyth, and ambitions to rise above his position teaching English literature at the local grammar school. Thomas had one sibling, Nancy Marles (1906–1953), who was eight years his senior. The red-brick, semi-detached house at 5 Cwmdonkin Drive (in the Uplands area), in which Thomas was born and lived until he was 23, had been bought by his parents a few months before his birth. At the 1921 census, Nancy and Dylan are noted as speaking both Welsh and English. Their parents were also bilingual in English and Welsh, and Jack Thomas taught Welsh at evening classes. One of their Swansea relations has recalled that, at home, "Both Auntie Florrie and Uncle Jack always spoke Welsh." There are three accounts from the 1940s of Dylan singing Welsh hymns and songs, and of speaking a little Welsh. Thomas's father chose the name Dylan, which could be translated as "son of the sea" after Dylan ail Don, a character in The Mabinogion. His middle name, Marlais, was given in honour of his great-uncle, William Thomas, a Unitarian minister and poet whose bardic name was Gwilym Marles. The name Dylan being pronounced [ˈdəlan] in Welsh caused his mother to worry that he might be teased as the "dull one". When he broadcast on Welsh BBC early in his career, he was introduced using this pronunciation.
Focke-Wulf formally merged with Weserflug in 1964, becoming Vereinigte Flugtechnische Werke (VFW), which after several further mergers became the European Aeronautic Defence and Space Company N.V. (EADS). EADS was later renamed as Airbus. In early 2021 Focke Wulf Aircraft was re-registered as a trademark across the EU, the UK and Australia as a retailer of aviation watches and associated official Focke Wulf merchandise.
== Synthesis == It can be synthesized from catechol first by conversion to methylenedioxybenzene, which is brominated and coupled with allyl bromide. Safrole is a versatile precursor to many compounds. Examples are N-acylarylhydrazones and isosters, aryl-sulfonamide derivatives, acidic sulfonylhydrazone derivatives, benzothiazine derivatives and many more.
Sources: en.wikipedia.org
Gone with the Wind itself may have been briefly overtaken by The Ten Commandments (1956), which closed at the end of 1960 with worldwide rentals of $58–60 million compared to Gone with the Wind's $59 million; if it did claim the top spot its tenure there was short-lived, since Gone with the Wind was re-released the following year and increased its earnings to $67 million. Depending on how accurate the estimates are, the 1959 remake of Ben-Hur may also have captured the record from Gone with the Wind: as of the end of 1961 it had earned $47 million worldwide, and by 1963 it was trailing Gone with the Wind by just $2 million with international takings of $65 million, ultimately earning $66 million from its initial release.
Schoenheimer's scientific work contributed to biochemistry and metabolic studies, with his most significant work being the application of isotopes to the study of intermediary metabolism. Schoenheimer's earlier scientific work in the 1920s centered on the physiology and pathology of sterols.
==== United States ==== The US Food and Drug Administration (FDA) considers safe beverages containing less than 0.02% caffeine; but caffeine powder, which is sold as a dietary supplement, is unregulated. It is a regulatory requirement that the label of most prepackaged foods must declare a list of ingredients, including food additives such as caffeine, in descending order of proportion. However, there is no regulatory provision for mandatory quantitative labeling of caffeine, (e.g., milligrams caffeine per stated serving size). There are a number of food ingredients that naturally contain caffeine. These ingredients must appear in food ingredient lists. However, as is the case for "food additive caffeine", there is no requirement to identify the quantitative amount of caffeine in composite foods containing ingredients that are natural sources of caffeine. While coffee or chocolate are broadly recognized as caffeine sources, some ingredients (e.g., guarana, yerba maté) are likely less recognized as caffeine sources. For these natural sources of caffeine, there is no regulatory provision requiring that a food label identify the presence of caffeine nor state the amount of caffeine present in the food. The FDA guidance was updated in 2018.
Venlafaxine was approved for medical use in the United States in 1993. It is available as a generic medication. In 2023, it was the 51st most commonly prescribed medication in the United States, with more than 13 million prescriptions.
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.
It is a tripeptide of glutamate, cysteine, and glycine. The glutamate-cysteine bond is unusual because it forms through the gamma-carboxyl group.