thiol comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-06-04. Numbers and descriptions here follow the published literature rather than marketing material.
Glutathione supports several cellular processes beyond direct antioxidant action. It serves as a cofactor for glutathione peroxidase and glutathione S-transferase enzymes, which reduce peroxides and conjugate electrophiles, respectively. The molecule also acts as a reservoir of cysteine, an amino acid that can limit protein synthesis and redox signaling. In human nutrition, oral glutathione is sold as a supplement, but how much intact glutathione reaches tissues after ingestion remains an active research question. Clinical claims about supplementation are not uniformly supported by controlled trials.
Glutathione is a small tripeptide built from glutamic acid, cysteine, and glycine. Its peptide bond between glutamate and cysteine involves the gamma-carboxyl group rather than the usual alpha-carboxyl group. This structure gives the molecule a reactive thiol on the cysteine residue. The reduced form, often abbreviated GSH, is the predominant intracellular species in many cell types. Because the thiol can donate electrons, glutathione participates in redox chemistry and in the conjugation of reactive molecules.
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 |
|---|---|---|
| Molecular formula | C10H17N3O6S | Reduced form; oxidized dimer is C20H32N6O12S2 |
| Molar mass | 307.32 g/mol | For reduced glutathione (GSH) |
| Appearance | White crystalline powder | Typical laboratory and supplement-grade material |
| Solubility | Soluble in water | Poorly soluble in ethanol and other nonpolar solvents |
| Typical storage | -20 C, desiccated, protected from light | Reduced form can oxidize in solution |
== Businesses and organizations == Rainforest Partnership, an environmental organization based in Austin, Texas RallyPoint, a social network for the US military Reform Party (Singapore), an opposition party in Singapore led by Kenneth Jeyaretnam Republic Polytechnic, a polytechnic in Singapore Rheinische Post, a German newspaper Rhône-Poulenc, a former French chemical company Royal Society of Portrait Painters (London), with membership indicated RP Roma Party (Romska partija), a political party in Serbia Welfare Party, or Refah Partisi, in Turkey Chautauqua Airlines, the IATA airline designator RP
The use of X-rays for diagnostic purposes in dentistry was made possible by the pioneering work of C. Edmund Kells (1856-1928), a New Orleans dentist who demonstrated them to dentists in Asheville, North Carolina, in July 1896. Kells committed suicide after suffering from radiation-induced cancer for many years. He had been amputated one finger at a time, later his entire hand, followed by his forearm and then his entire arm. Otto Walkhoff (1860-1934), one of the most important German dentists in history, took X-rays of himself in 1896 and is considered a pioneer in dental radiology. He described the required exposure time of 25 minutes as an "ordeal". Braunschweig's medical community later commissioned him to set up and supervise a central X-ray facility. In 1898, the year radium was discovered, he also tested the use of radium in medicine in a self-experiment using an amount of 0.2 grams of radium bromide. Walkhoff observed that cancerous mice exposed to radium radiation died significantly later than a control group of untreated mice. He thus initiated the development of radiation research for the treatment of tumors.
=== Artificial === De novo designed peptides which self-assemble in the presence of copper (Cu), forming supramolecular assemblies were presented by Korendovych et al. Additionally there are examples of metallopeptides that are, at least partially, composed of non-natural amino acids with possible applications in drug discovery and biomaterials.
Fibronectin is a high molecular weight (approximately 500–600 kDa) glycoprotein of the extracellular matrix that binds to membrane-spanning receptor proteins called integrins. Fibronectin also binds to other extracellular matrix proteins such as collagen, fibrin, and heparan sulfate proteoglycans (e.g. syndecans). Fibronectin exists as a protein dimer, consisting of two nearly identical monomers linked by a pair of disulfide bonds. The fibronectin protein is produced from a single gene, but alternative splicing of its pre-mRNA leads to the creation of several isoforms. Two types of fibronectin are present in vertebrates:
=== Long-term effects === Regular use of large amounts of kava may cause mood swings, apathy, dry, scaly skin, malnutrition, weight loss, increased susceptibility to infections, and shortness of breath. Long-term use has also been associated with liver damage; however, the available evidence remains inconclusive. The risk is higher with alcoholic or acetonic extracts, or concentrated forms like pills. Water-based kava extracts in moderate doses are considered safer, but should not be consumed with alcohol, particularly in those with a history of liver issues.
Sources: en.wikipedia.org
The MR vaccine (abbreviated "MRV") is a vaccine for measles and rubella, not mumps. In 2014, the World Health Organization reported it as used in a "few (unidentified) countries". A MRV delivered by a microneedle patch was the subject of a study reported in 2024.
Another measure that made him detested by the indigenous people were the appraisals made in the midst of the war chaos, without control and many times by officials who were members of the Criollo aristocracy or bought by it, which allowed the individual division of their communal lands and their purchase by the landowners, in addition to restoring indigenous tributes, mitas, and pongueajes to help Peruvian finances. Likewise, he restored slavery to blacks, pardos and mulattos (which had been abolished by San Martín) for the benefit of sugar plantations on the coast. Lastly, the old colonial cabildos were abolished. It can also be shown that he would have carried out massive repressions against opponents who had his dictatorship in Peru, such as Juan de Berindoaga y Palomares (who was shot) or Francisco Xavier de Luna Pizarro (who would be deported). Sucre would have commented on several occasions to the Liberator that so many tributes were deceptive, and that many of the Peruvian elite wanted Bolívar's failure to run to negotiate with the royalists. The Bolivarian regime quickly earned the animosity of Peruvians: Bolívar created a Supreme Court that imprisoned or exiled various political opponents, and shot patriotic soldiers or guerrillas who publicly disagreed. The exercise of freedom of the press was prevented and the right to elect their municipal authorities was withdrawn from the councils (May 26, 1826). Over time the Colombian army was seen as the Praetorian Guards of its puppet governments.
=== Average chemical characteristics === On average, healthy humans eliminate 128 g of fresh feces per person per day with a pH value of around 6.6 as indicated by a Fecal pH test. Fresh feces contains around 75% water and the remaining solid fraction is 84–93% organic solids along with some insoluble phosphate salts. These organic solids consist of: 25–54% bacterial biomass, 2–25% protein or nitrogenous matter, 25% carbohydrate or undigested plant matter, and 2–15% fat. Protein and fat come from the colon due to secretion, epithelial shedding, and gut bacterial action. These proportions vary considerably depending on many factors but mainly diet and body weight. The remaining solids are composed of insoluble calcium and iron phosphate salts, intestinal secretions, small amounts of dried epithelial cells, and mucus.
ATTR can be identified using isoelectric focusing which separates mutated forms of transthyretin. Findings can be corroborated by genetic testing to look for specific known mutations in transthyretin that predispose to amyloidosis. AA is suspected on clinical grounds in individuals with longstanding infections or inflammatory diseases. AA can be identified by immunohistochemistry staining.
Sources: en.wikipedia.org
It is a tripeptide of glutamic acid, cysteine, and glycine. The linkage between glutamate and cysteine uses the gamma-carboxyl group, which is unusual for peptides.
GSH is the reduced form with a free thiol group. GSSG is the oxidized dimer formed when two GSH molecules join by a disulfide bond.
It is synthesized inside cells and is not classified as an essential dietary nutrient for most people. Dietary and supplemental sources are studied, but direct requirements are not established in the same way as for vitamins.
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.