The short version of glutathione fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-11-23 and is reviewed periodically as new material appears.
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 occurs in two ATP-dependent steps. The enzyme glutamate-cysteine ligase joins glutamate and cysteine, forming gamma-glutamylcysteine; glutathione synthetase then adds glycine to produce the complete tripeptide. Because the peptide bond from glutamate uses the gamma-carboxyl group, glutathione resists digestion by many ordinary peptidases. Tissues vary in synthesis capacity, and the liver generally contains high concentrations relative to many other organs. This uneven distribution contributes to organ-specific differences in redox buffering and affects how experimental results are interpreted across tissue types.
Glutathione is synthesized in two ATP-dependent steps. First, gamma-glutamylcysteine synthetase links glutamate and cysteine; second, glutathione synthetase adds glycine to form the complete tripeptide. The pathway is feedback-inhibited by GSH itself, which helps maintain steady intracellular levels. Tissues vary widely in glutathione content, with the liver typically containing the highest concentrations, followed by the kidneys, lungs, and erythrocytes. Because cysteine is often limiting, its availability influences synthesis rates, and regulation of this pathway varies by cell type.
Glutathione serves as a cofactor for several enzymes, including glutathione peroxidase and glutathione S-transferase. These enzymes help reduce hydrogen peroxide and lipid peroxides, and they conjugate reactive electrophiles for excretion. The molecule also acts as a reservoir for cysteine, an amino acid that is prone to oxidation. In addition, glutathione participates in the metabolism of nitric oxide, leukotrienes, and prostaglandins. Its roles extend to cell signaling, apoptosis, and the regulation of protein function through S-glutathionylation.
| 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. |
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.
Quality control for glutathione focuses on identity, purity, and oxidation state. Certificates of analysis may report assay value, water content, and the presence of GSSG or other impurities. Chromatographic purity is often expressed as a percentage of peak area. Reference standards help laboratories compare results across instruments and batches. Because glutathione is a small, polar molecule, separation from cysteine, gamma-glutamylcysteine, and related thiols can be challenging. Verification often combines more than one analytical technique.
Measuring glutathione requires attention to sample preparation because the molecule oxidizes readily. Blood, tissue, and cell samples are often treated with acid to precipitate proteins and stabilize the thiol. Without such steps, GSH can convert to GSSG or form mixed disulfides during storage. Analytical methods include spectrophotometric assays, high-performance liquid chromatography, and mass spectrometry. Each approach has different sensitivity, specificity, and susceptibility to interference from related compounds in complex matrices.
=== Sleep sedation === While benzoctamine was made to be an alternative to the benzodiazepine line of anxiolytic drugs, other uses for the drug have been discovered. Due to benzoctamine's ability to tranquilize without causing respiratory depression, scientists are moving forward with studies that test its sedative effects in patients with respiratory failure. In one study that used benzoctamine in a clinical setting, researchers showed that the use of benzoctamine for sedation did not result in changes in forced expiratory volume in one second or carbon dioxide partial pressure (pCO2). This confirmed previous statements that claimed the drug did not cause respiratory failure. The main goal of this clinical study was to confirm the findings of another study that showed benzoctamine did not reduce CO2 responsiveness, but instead increased the ventilatory response to CO2. There are usually many risks associated with using sedatives on patients who are suffering from respiratory failure, which has made it difficult to administer tranquillizing medications in situations when they are desirable. It is not known why this drug is safe and its benzodiazepine cousins are not, but a possible explanation for this phenomenon might come from its similarity in structure to tricyclic antidepressants, which have also been shown to not cause respiratory failure. While further experimentation is necessary, this study points to benzoctamine's possible consideration for sedation in respiratory failure patients.
== Awards and honours == 2020 Preis der Stadt Wien für Naturwissenschaften 2017 European Research Council (ERC) Advanced Grant 2015 Honorary member of the Swiss Society for Allergology and Immunology 2010 Virchow Medal, Medical Faculty, University of Würzburg 2012 European Research Council (ERC) Advanced Grant 2009 Full member of the Austrian Academy of Sciences 2005 Corresponding member of the Austrian Academy of Sciences 2001 Wittgenstein Award 2000 Member of the Academia Europaea 1990 Member of the European Molecular Biology Organization (EMBO) 1981 Postdoctoral fellowship (Swiss National Science Foundation)
== Ownership == In 2002, Laboratory Corporation of America Holdings (LabCorp), a clinical lab provider based in the United States, acquired Dynacare Laboratories. LabCorp purchased all of Dynacare's outstanding shares for US$480 million and assumed Dynacare's debt of US$205 million. At the time of purchase, Dynacare medical laboratories provided services in Canada and in 21 American states. The Globe and Mail reported that the takeover would not have an effect on "Dynacare's operational partnerships with Gamma NorthPeel and Bio-Science Laboratory in Ontario and with Kasper Medical Laboratories and MDS Laboratories in Alberta".
A member of Parliament is a member of either of the two houses of the Indian Parliament: Lok Sabha (lower house) and Rajya Sabha (upper house). Lok Sabha has 543 seats, all of whom are directly elected by the citizens of India from each parliamentary constituency of states and union territories via first-past-the-post voting. Rajya Sabha can have 245 members, of which 238 members are indirectly elected. Of these 238 members, 229 belong to the state legislatures and 9 belongs to the union territories of Delhi, Puducherry, and Jammu and Kashmir, and are elected by using the single transferable vote method of proportional representation. The remaining 12 members are nominated by the president for their contributions to art, literature, science, and social services. Each state has a fixed number of representatives allocated in each chamber, in order of their respective populations. The state of Uttar Pradesh has the greatest number of representatives in both houses. The person which secures the support of more than half the seats in the Lok Sabha forms the Government. To form the government, parties may form a coalition. The term of a member of the Rajya Sabha is six years, while Lok Sabha members are elected for a term of five years, unless the house is dissolved sooner. Rajya Sabha is a permanent house that is not subject to dissolution, and one third of the members retire every two years.
Sources: en.wikipedia.org
== History == Zolpidem was used in Europe starting in 1988 and was brought to market there by Synthelabo. Synthelabo and Searle collaborated to bring it to market in the US, and it was approved in the United States in 1992 under the brand name "Ambien". It became available as a generic medication in 2007. In 2015, the American Geriatrics Society said that zolpidem, eszopiclone, and zaleplon met the Beers criteria and should be avoided in individuals 65 and over "because of their association with harms balanced with their minimal efficacy in treating insomnia." The AGS stated the strength of the recommendation that older adults avoid zolpidem is "strong" and the quality of evidence supporting it is "moderate."
== September == 2 September With the outcome of the war still in question, Chairman of the Workers' Party of Vietnam Hồ Chí Minh died on the morning of 2 September 1969, at his home in Hanoi at age 79 from heart failure.
The International Federation of Clinical Chemistry and Laboratory Medicine (IFCC) is a global professional association that promotes the fields of clinical chemistry and laboratory medicine. It was established in Paris in 1952 as the International Association of Clinical Biochemists to organize the various national societies of these fields and is based in Milan, Italy. The IFCC's aims are to set global standards, support and educate its members, and provide conferences and other gatherings for sharing knowledge among the global laboratory medicine community. IFCC members fall into three groups: national societies of clinical chemistry and laboratory medicine, corporations, and affiliate international or national societies involved in laboratory medicine. As of 2023, these members represented more than 45,000 individual clinical chemists, laboratory scientists, and laboratory physicians.
== Adverse effects == Although generally well tolerated and numerous advantages over other antidepressants, SSRIs are not devoid of adverse effects. The adverse effects of SSRIs are usually predictable from a knowledge of their pharmacology and are dose related. Such adverse effects are gastrointestinal dysfunction (nausea, diarrhea, epigastric discomfort), effects on the central nervous system (CNS) (anxiety, fatigue, tremor), anticholinergic effects (dry mouth, blurred vision, drowsiness, difficulty in urination) and sexual dysfunction (anorgasmia, low to no libido, erectile dysfunction, numb genitals, retrograde ejaculation, loss of erotic dreams or delayed ejaculation). Occasionally symptoms of sexual dysfunction persist after discontinuation of SSRIs. SSRIs adverse effects are generally mild and temporary and are more of a discomfort than a serious threat in terms of systemic toxicity. Therefore, the adverse effect profile of the SSRIs may offer certain therapeutic advantages in the management of depression.
== Side effects == The most common side effects of tizanidine (>10%) include somnolence, dry mouth, asthenia (including weakness, fatigue, and/or tiredness), dizziness, hypotension, and bradycardia. At doses of 8 to 16 mg, the rates of these side effects were 78–92% for somnolence, 76–88% for dry mouth, 67–78% for asthenia, 22–45% for dizziness, 16–33% for hypotension, and 2–10% for bradycardia. Additional side effects of tizanidine may include drowsiness, nervousness, confusion, hallucinations, strange dreams, depression, vomiting, constipation, diarrhea, stomach pain, heartburn, increased muscle spasms, back pain, rash, sweating, and tingling sensations in the arms, legs, hands, and feet. Tizanidine can cause withdrawal symptoms upon abrupt discontinuation and should be gradually tapered to avoid and minimize such symptoms. Withdrawal symptoms include rebound hypertension, tachycardia, hypertonia, tremor, and anxiety.
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 tripeptide of three amino acids: glutamate, cysteine, and glycine. The cysteine residue provides the sulfhydryl group that gives the molecule its reducing properties.