Everything below concerns thiol group. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-01-22. Where a claim depends on a specific study, the study is described rather than over-claimed.
Glutathione participates in detoxification reactions, amino acid transport, and the maintenance of protein thiols. It serves as a cofactor for several enzymes, including glutathione peroxidases and glutathione S-transferases. In research literature, altered glutathione status appears in studies of aging, infection, metabolic stress, and environmental exposure. Whether low glutathione is a cause, consequence, or marker of such conditions often remains unresolved. Direct measurement in blood or tissue provides a snapshot, but results depend on sample handling, timing, and the method used.
Glutathione is a small tripeptide made of glutamic acid, cysteine, and glycine. Its cysteine thiol group allows reversible oxidation and reduction, making it central to cellular redox chemistry. The reduced form, often abbreviated GSH, predominates inside most cells, while the oxidized disulfide form, GSSG, forms when two GSH molecules react. The ratio of GSH to GSSG is widely used as an indicator of oxidative stress in laboratory research, though it does not by itself diagnose a clinical condition.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C10H17N3O6S | Reduced glutathione (GSH); oxidized form differs by disulfide linkage. |
| Molar mass | 307.32 g/mol | Calculated for the reduced tripeptide. |
| Appearance | White to off-white crystalline powder | Typical laboratory reagent description. |
| Solubility | Soluble in water | Aqueous solutions are acidic; solubility depends on pH and salt form. |
| CAS Registry Number | 70-18-8 | Refers to reduced L-glutathione; oxidized form has a different number. |
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.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. Its cysteine residue carries a thiol group, which allows the molecule to participate in reduction and oxidation reactions. The compound exists in most living cells, where the reduced form, often abbreviated GSH, is usually more abundant than the oxidized disulfide form, GSSG. Intracellular concentrations are commonly in the millimolar range, while extracellular concentrations are much lower. This uneven distribution supports its role as a major cellular redox buffer.
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.
Cells synthesize glutathione through two ATP-dependent steps: glutamate-cysteine ligase joins glutamate and cysteine, and glutathione synthetase adds glycine to form the complete tripeptide. Breakdown occurs through gamma-glutamyl transpeptidase and subsequent peptidase reactions, forming the gamma-glutamyl cycle. Within cells, glutathione also forms a disulfide-linked dimer called GSSG when two GSH molecules react. The balance between GSH and GSSG is widely used as an indicator of oxidative conditions, although the ratio can vary by compartment and tissue.
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.
=== Andy: Get The Poison Out === First aired: 4 November 2010 Meet Andy, the self-appointed king of Fresno. He is an obnoxious bully who makes life miserable for his victims, Steven and Taylor. He also makes the biggest mistake of calling out Mayhem, so Mayhem brings out "the greatest fighter he has ever known" to take care of Andy. That fighter turns out to be Mayhem himself. After easily being tapped out 5 times in the first round and knocked out in the second round, Steven and Taylor won $10,000. After the fight, Mayhem tells a humbled Andy that he had to deal with bullies most of his life and implores him to change his ways because he eventually will come across someone that is bigger, badder and meaner than Andy himself.
== Function == Tendon cells are primarily responsible for the production and maintenance of the tendon extracellular matrix (ECM), which consists mainly of collagen fibers. These cells are involved in synthesizing collagen and other ECM components that provide tendons with tensile strength. Tendon cells also participate in remodeling the ECM in response to mechanical stress and injury.
=== Etymology === Although according to the Oxford English Dictionary, the term "beriberi" comes from a Sinhalese phrase meaning "weak, weak" or "I cannot, I cannot", the word being duplicated for emphasis, the origin of the phrase is questionable. It has also been suggested to come from Hindi, Arabic, and a few other languages, with many meanings like "weakness", "sailor", and even "sheep". Such suggested origins were listed by Heinrich Botho Scheube, among others. Edward Vedder wrote in his book Beriberi (1913) that "it is impossible to definitely trace the origin of the word beriberi". The word berbere was used in writing at least as early as 1568 by Diogo do Couto, when he described the deficiency in India. Kakke (脚気), which is a Japanese synonym for thiamine deficiency, comes from the way "jiao qi" is pronounced in Japanese. "Jiao qi" is an old word used in Chinese medicine to describe beriberi. "Kakke" is supposed to have entered into the Japanese language sometime between the sixth and eighth centuries.
(2005), philanthropist, investor, activist, son of John Kluge '37 Alana Mayo (2006), president of Orion Pictures Liesel Pritzker Simmons (2006), former child actress, A Little Princess; granddaughter of businessman Abram Nicholas Pritzker, heiress to the Hyatt hotels fortune, philanthropist Wayne Ting (2006), CEO of Lime Marco Zappacosta (2007), co-founder and CEO of Thumbtack, son of Logitech founder Pierluigi Zappacosta Adam Pritzker (2008), co-founder of General Assembly, grandson of Jay Pritzker and member of the Pritzker family Jared Hecht (2009), co-founder of GroupMe Ariana Rockefeller (2009), fashion designer and great-great-granddaughter of John D. Rockefeller Zach Sims* (2012), co-founder of Codecademy Beverly Leon (2014), former midfielder of Sunderland A.F.C. Ladies, CEO of Local Civics Nicole LaPointe Jameson (2016), CEO of Evil Geniuses Korawad Chearavanont* (2017), Thai internet entrepreneur and grandson of Dhanin Chearavanont
Sources: en.wikipedia.org
In the 20-naughts, Gavi had intense internal debate about its role in vaccinations and in health systems strengthening (HSS). This was part of a broader discussion in healthcare about "vertical" approaches (often targeting specific diseases or behaviours) and "horizontal" ones, targeting broad programs such as primary care. At Gavi, some argued that vaccination could not be effectively carried out and sustained without strengthening healthcare, citing experiences in Gavi's vaccination programmes, where availability of staff, training, transport, and funds had hindered vaccination and reporting of vaccination coverage and stocks. There were also worries that Gavi was undermining and paralyzing health care systems. Others argued that HSS was a distraction from Gavi's single-minded focus on vaccines, and HSS was a nebulous concept that could not be defined and quantified. Major donors Norway and Britain supported HSS; USAID and the Bill & Melinda Gates Foundation (and Bill Gates personally) opposed it. The majority of vaccine experts tended to favour technological rather than HSS-based approaches. Pharmaceutical industry representatives were supportive of HSS, possibly because they saw it as key to sustainable markets for their products. In 2005, a narrow vote brought Gavi to endorse an HSS goal. Up to a quarter of Gavi's funding was dedicated to "strengthening the capacity of integrated health systems to deliver immunisation", in practice it has been around 10%. After 2010, this funding went through a joint-venture Health Systems Funding Platform.
An active celebrity in the climate change movement, DiCaprio believes global warming is the world's "number-one environmental challenge". Eager to learn about ecology from an early age, he would watch documentaries on rainforest depletion and the loss of species and habitats. In 1998, he established the Leonardo DiCaprio Foundation, a non-profit organization devoted to promoting environmental awareness. It supports organizations and campaigns committed to ensuring a viable future for planet Earth, and produced the short web documentaries Water Planet and Global Warning. The foundation has also funded debt-for-nature swaps. By 2018, the foundation had funded more than 200 projects, providing $100 million in support. He has been an active supporter of numerous environmental organizations and sat on the board of the World Wildlife Fund and International Fund for Animal Welfare. DiCaprio has owned environment-friendly electric-hybrid vehicles. His use of private jets and large yachts have been criticized as hypocritical due to their large carbon footprints. DiCaprio chaired the national Earth Day celebration in 2000 where he interviewed Bill Clinton and they discussed plans to deal with global warming and the environment. He presented at the 2007 American leg of Live Earth. DiCaprio donated $1 million to the Wildlife Conservation Society at Russia's Tiger Summit. DiCaprio's persistence in reaching the event after encountering two plane delays caused then Prime Minister Vladimir Putin to describe him as a "muzhik" or "real man".
== Modern scientific uses == Though insects were widely used throughout history for medical treatment on nearly every continent, relatively little medical entomological research has been conducted since the revolutionary advent of antibiotics. Heavy reliance on antibiotics, coupled with discomfort with insects in Western culture limited the field of insect pharmacology until the rise of antibiotic resistant infections sparked pharmaceutical research to explore new resources. Arthropods represent a rich and largely unexplored source of new medicinal compounds.
In their landmark 1987 paper, Hon Cheung Lee and colleagues discovered not one but two Ca2+-mobilizing second messengers, cADPR and NAADP from the effects of nucleotides on Ca2+ release in sea urchin egg homogenates. It turns out that NAADP was a contaminant in commercial sources of NADP, but it was not until 1995 that its structure was solved. The first demonstration that NAADP could act in mammalian cells (pancreas) came four years later. Subsequently, NAADP has been detected in sources as diverse as human sperm, red and white blood cells, liver, and pancreas, to name but a few.
== Further reading == Hofmeister F. (1888) Arch. Exptl. Pathol. Pharmakol., 24, 247. Zhang, Y; Cremer, P (December 2006). "Interactions between macromolecules and ions: The Hofmeister series". Current Opinion in Chemical Biology. 10 (6): 658–63. doi:10.1016/j.cbpa.2006.09.020. PMID 17035073. Zhou, Huan-Xiang (October 2005). "Interactions of macromolecules with salt ions: an electrostatic theory for the Hofmeister effect". Proteins: Structure, Function, and Bioinformatics. 61 (1): 69–78. doi:10.1002/prot.20500. PMID 16044460. S2CID 4996928. Tanford C and Reynolds J. (2001) Nature's robots: a history of proteins, Oxford University Press. ISBN 0-19-850466-7 Creighton TE. (1993) Proteins, 2nd ed., W. H. Freeman. ISBN 0-7167-2317-4 Jencks WP. (1969) Catalysis in Chemistry and Enzymology, Dover republication (1987). ISBN 0-486-65460-5 Collins, KD.; Washabaugh, MW. (1985). "The Hofmeister effect and the behaviour of water at interfaces". Q Rev Biophys. 18 (4): 323–422. doi:10.1017/s0033583500005369. PMID 3916340. John Leo, Abernethy (1967). "Franz Hofmeister - The impact of his life and research on chemistry". Journal of Chemical Education. 44 (3): 177–80. Bibcode:1967JChEd..44..177A. doi:10.1021/ed044p177. PMID 5343300.
Sources: en.wikipedia.org
GSH is the reduced form of glutathione, with a free thiol group on cysteine. GSSG is the oxidized disulfide form, created when two GSH molecules become linked. The two forms exist together, and their balance is often reported as the GSH/GSSG ratio in laboratory studies.
Glutathione is synthesized inside cells from amino acids rather than being classified as an essential dietary nutrient. Dietary sources can provide glutathione or its precursors, but digestion and absorption alter what reaches tissues. Research continues on how dietary intake relates to cellular glutathione levels.
The liver has high glutathione concentrations and uses the compound in conjugation and antioxidant reactions. These reactions are relevant to the processing of drugs, pollutants, and normal metabolic byproducts. Studies often examine liver glutathione as a marker of oxidative stress or detoxification capacity.
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.