Everything below concerns redox ratio. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-08-01. 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.
In living systems, glutathione occurs in millimolar concentrations in many cell types, while extracellular levels are generally much lower. The liver holds a substantial share of the body's total pool, and the molecule participates in reduction, detoxification, and amino acid transport. It also serves as a cofactor for enzymes such as glutathione peroxidase and glutathione S-transferase. Because the cysteine residue supplies a reactive thiol, glutathione can donate electrons and become oxidized. Cells regenerate reduced glutathione through glutathione reductase using NADPH.
Commercial glutathione is produced by microbial fermentation or chemical synthesis, then purified. Reduced and oxidized grades are offered separately, with purity specifications often exceeding 98 percent. The compound appears in foods such as fresh fruits, vegetables, and meats, although cooking and processing can lower amounts. Oral, topical, and inhaled forms are discussed in research and consumer contexts, but absorption and tissue delivery remain active areas of study. Regulatory status varies by country and intended use.
| 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. |
Interpreting glutathione measurements requires attention to pre-analytical variables. The GSSG concentration in a sample can rise artificially during storage or processing, making the GSH/GSSG ratio unreliable if not controlled. Reference ranges vary by specimen type, assay, and population, so comparisons across studies are difficult. Plasma glutathione is low and sensitive to hemolysis, while whole blood reflects primarily erythrocyte content. Many studies measure total glutathione rather than the reduced and oxidized forms separately, which limits conclusions about redox status.
Accurate measurement of glutathione begins with careful sample handling. Because GSH oxidizes rapidly to GSSG, samples must be processed quickly or frozen immediately. Acid precipitation with metaphosphoric acid or perchloric acid is common; it lowers pH, precipitates proteins, and helps preserve the reduced form. Chelating agents such as EDTA can limit metal-catalyzed oxidation. For whole blood, hemolysis releases glutathione from erythrocytes, so plasma and serum values differ substantially from whole blood values.
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.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine, and it is the most abundant non-protein thiol in most living cells. The reduced form, GSH, carries a sulfhydryl group that can donate electrons, while the oxidized form, GSSG, forms when two GSH molecules link via a disulfide bond. The balance between these two forms helps define the cellular redox environment, and their ratio is often used as an indicator of oxidative stress. Because the sulfhydryl group is reactive, glutathione participates in many cellular processes, including detoxification and protein regulation.
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.
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.
Stability depends on pH, temperature, oxygen exposure, and trace metals. Aqueous solutions of reduced glutathione are susceptible to oxidation, especially when neutral or alkaline and exposed to air. Transition metal ions can catalyze thiol oxidation, so chelators and inert atmospheres are sometimes used in research settings. Standards are typically stored cold and desiccated, with limited freeze-thaw cycles. Questions remain about how closely in vitro stability data reflect the behavior of glutathione within intact cells and tissues.
Measuring glutathione requires attention to oxidation during sample handling, because GSH in biological samples can convert to GSSG or form mixed disulfides with proteins after collection. Acidic extraction, rapid cooling, and chelating agents are commonly used to limit such changes. Analytical methods usually distinguish free reduced glutathione, total glutathione, and protein-bound forms. Because these forms have different stability and reactivity, reported values depend heavily on the preparation protocol. No single preparation is universally suitable for every biological matrix or analytical goal.
Several techniques are used for quantification. Enzymatic recycling assays rely on glutathione reductase and a colorimetric or fluorescent readout, offering sensitivity for total glutathione. High-performance liquid chromatography can separate GSH from GSSG and other thiols, often with UV, fluorescence, or electrochemical detection. Mass spectrometry provides structural confirmation and can quantify low-abundance species when paired with separation. Each approach has trade-offs in specificity, throughput, and equipment requirements, so method selection depends on the research question and available instrumentation.
== Awards and accolades == New York Magazine Gael Greene's Restaurant of the Year – Mesa Grill (1992) French Culinary Institute Outstanding Graduate Award (1993) International Association of Culinary Professionals Award for Design – Bobby Flay's Bold American Food (1995) Four-time Daytime Emmy Award winner: Outstanding Service Show Host – Boy Meets Grill (2005) Best Culinary Program – Grill It! With Bobby Flay (2009) Outstanding Culinary Host – Bobby Flay's Barbecue Addiction (2014) Outstanding Culinary Host – Bobby Flay's Barbecue Addiction (2015) Three-time James Beard Foundation Award winner: Rising Star Chef of the Year (1993) National Television Food Show Award – Bobby Flay Chef Mentor (2005) Who's Who of Food & Beverage in America (2007) Culinary Hall of Fame Induction (2015) Star on Hollywood Walk of Fame (2015)
=== Discrimination === In March 2021, Eli Lilly and Company was accused of sex discrimination by a former lobbyist who claimed she was forced to work in a sexually hostile work environment. The parties involved settled for an undisclosed amount in June 2021. In September 2021, Eli Lilly and Company was accused in a federal court lawsuit of discriminating against older applicants for sales positions based on their implementation of hiring quotas for millennials.
Early in the twentieth century Walter Cannon, who had popularized the idea of a sympathoadrenal system preparing the body for fight and flight, and his colleague Arturo Rosenblueth developed a theory of two sympathins, sympathin E (excitatory) and sympathin I (inhibitory), responsible for these actions. The Belgian pharmacologist Zénon Bacq as well as Canadian and U.S. pharmacologists between 1934 and 1938 suggested that noradrenaline might be a sympathetic transmitter. In 1939, Hermann Blaschko and Peter Holtz independently identified the biosynthetic mechanism for norepinephrine in the vertebrate body. In 1945 Ulf von Euler published the first of a series of papers that established the role of norepinephrine as a neurotransmitter. He demonstrated the presence of norepinephrine in sympathetically innervated tissues and brain, and adduced evidence that it is the sympathin of Cannon and Rosenblueth. Stanley Peart was the first to demonstrate the release of noradrenaline after the stimulation of sympathetic nerves.
Despite the vulture crisis, diclofenac remains available in other countries including many in Europe. It was controversially approved for veterinary use in Spain in 2013 and continues to be available, despite Spain being home to around 90% of the European vulture population and an independent simulation showing that the drug could reduce the population of vultures by 1–8% annually. Spain's medicines agency presented simulations suggesting that the number of deaths would be quite small. A paper published in 2021 identified the first authenticated death of a vulture from diclofenac in Spain, a cinereous vulture. Diclofenac is on the European Union's watch list because it pollutes the Baltic Sea. When the substance enters fresh water, it has an environmental impact and is considered more difficult to remove in wastewater treatment plants than, for example, ibuprofen. Diclofenac has been shown also to harm freshwater fish species such as rainbow trout. Harmful residues have been found in fish, blue mussels, and other aquatic organisms, where it has been found to cause damage to internal organs such as the gills, kidneys and liver.
Sources: en.wikipedia.org
After Ceaușescu was summarily executed, the National Salvation Front (FSN) quickly took power, promising free and fair elections within five months. Elected in a landslide the following May, the FSN reconstituted as a political party, installed a series of economic and democratic reforms, with further social policy changes being implemented by later governments. From that point on, Romania has become far more integrated with the West. Romania became a member of NATO and the European Union in 2004 and 2007, respectively.
States choose to balance for two reasons. First, they place their survival at risk if they fail to curb a potential hegemon before it becomes too strong; to ally with the dominant power means placing one's trust in its continued benevolence. Secondly, joining the weaker side increases the likelihood that the new member will be influential within the alliance. States choose to bandwagon because it may be a form of appeasement as the bandwagoner may hope to avoid an attack by diverting it elsewhere—a defensive reason—or because it may align with the dominant side in wartime to share the spoils of victory—an offensive reason. Realists claim that balancing is when states ally against the prevailing threat and results in a more secure world whereas in a bandwagoning world security is scarce as rising hegemons are not kept in check. With bandwagoning, the threatened state abandons hope of preventing the aggressor from gaining power at its expense and instead joins forces with its dangerous foe to get at least some small portion of the spoils of war. The weaker the state the more likely it is to bandwagon than to balance as they do little to affect the outcome and thus must choose the winning side. Strong states may change a losing side into a winning side and thus are more likely to balance. States will be tempted to bandwagon when allies are unavailable, however excessive confidence in allied support encourages weak states to free ride relying on the efforts of others to provide security.
=== Recent === Before 2020, no mRNA technology platform (drug or vaccine) had been approved for therapeutic use in humans, so there was a risk of unknown effects. The 2020 COVID-19 pandemic required faster production capability of mRNA vaccines, which made them attractive to national health organisations, and led to debate about the type of initial authorization mRNA vaccines should get (including emergency use authorization or expanded access authorization) after the eight-week period of post-final human trials.
=== Anastrozole === Anastrozole, brand name Arimidex, is a type of anti-estrogen used in treatment of breast cancer but is also used by bodybuilders to combat the estrogenic side effects associated with using anabolic steroids.
As Western imports became popular, demand for Japanese art declined within Japan itself. In Europe and America, the new availability of Japanese art led to a fascination for Japanese culture; a craze known in Europe as Japonisme. Imperial patronage, government sponsorship, promotion to new audiences, and Western technology combined to foster an era of Japanese artistic innovation. In the decorative arts, Japanese artists reached new levels of technical sophistication. Today, Masayuki Murata owns more than 10,000 Meiji art works and is one of the most enthusiastic collectors. From that time, most of the excellent works of Meiji Art were bought by foreign collectors and only a few of them remained in Japan, but because he bought back many works from foreign countries and opened the Kiyomizu Sannenzaka Museum, the study and reevaluation of Meiji Art rapidly advanced in Japan from the 21st century. Nasser Khalili is also one of the world's most dedicated collectors of Meiji art, and his collection encompasses many categories of Meiji art. The Japanese Imperial Family also owns excellent works of Meiji Art, some of which were donated to the state and are now stored in the Museum of the Imperial Collections.
Sources: en.wikipedia.org
retinal + NAD+ + H2O → retinoic acid + NADH + H+ Retinoic acid is actively transported into the cell nucleus by CRABp2 where it regulates thousands of genes by binding directly to gene targets via retinoic acid receptors. In addition to retinol, retinal and retinoic acid, there are plant-, fungi- or bacteria-sourced carotenoids which can be metabolized to retinol, and are thus vitamin A vitamers. There are also what are referred to as 2nd, 3rd and 4th generation retinoids which are not considered vitamin A vitamers because they cannot be converted to retinol, retinal or all-trans-retinoic acid. Some are prescription drugs, oral or topical, for various indications. Examples are etretinate, acitretin, adapalene, bexarotene, tazarotene and trifarotene.
== Firazyr (icatibant) == Jerini's lead compound Firazyr (icatibant), is an inhibitor of the action of the hormone bradykinin on its B2 receptor. This compound was in-licensed from Aventis in 2001. It has been approved for hereditary angioedema in all member states of the European Union in July 2008. The drug was granted FDA approval on August 25, 2011.
Mahathir was born at his parents' home in a poor neighbourhood at Lorong Kilang Ais, Alor Setar, in the capital of the Malay sultanate of Kedah under a British protectorate, on 10 July 1925. He was the first prime minister who was not born into the aristocracy or a prominent religious or political family. Mahathir's mother, Wan Tempawan Wan Hanapi, was a Malay from Kedah. His father, Mohamad Iskandar, was from Penang of Malay and Indian descent. Mahathir's paternal grandfather had come from Kerala, British India. Some claim that Mahathir's facial features resemble those of Kerala Chief Minister Pinarayi Vijayan, although they are not related. Mohamad Iskandar was the principal of an English-medium secondary school, whose lower-middle-class status meant his daughters were unable to enrol in a secondary school. Wan Tempawan Wan Hanapi had only distant relations to members of Kedah's royalty. Both had been married previously. Mahathir was born with six half-siblings and two full-siblings. His childhood home, with a single shared bedroom and no electricity supply, was later converted to a tourist attraction and opened to the public. During his childhood, Mahathir enjoyed playing snakes and ladders and demonstrated multiple creative talents, including playing the trumpet, interior decorating, and engaging in crafts and carpentry work. He once shared that he was bullied in his youth, recalling how he sold balloons for a small profit but was forced by a stronger peer to use his earnings to buy food for him.
== History == In the 18th century, young British chimney sweeps who climbed into chimneys suffered from chimney sweeps' carcinoma, a scrotal cancer peculiar to their profession, and this was connected to the effects of soot in 1775, in the first work of occupational cancer epidemiology and also the first connection of any chemical mixture to cancer formation. Frequent skin cancers were noted among fuel industry workers in the 19th century. In 1933, BaP was determined to be the compound responsible for these cases, and its carcinogenicity was demonstrated when skin tumors occurred in laboratory animals repeatedly painted with coal tar. BaP has since been identified as a prime carcinogen in cigarette smoke. Public health authorities distinguish between the addictive effects of nicotine and the carcinogenic substances present in cigarette smoke, such as BaP.
In March 2015, Markie Pasternak of Green Bay, Wisconsin, was diagnosed as the youngest person to be living with HSAM. Born in 1994, Pasternak remembers every day of her life since February 2005. She was featured on 60 Minutes Australia in August 2016 with Rebecca Sharrock. In January 2016, painter and polymath Nima Veiseh was featured by the BBC for his use of hyperthymesia to create paintings that were said to only be producible with vast memories of art pieces, although a paper published in the journal Memory in 2022 claimed that having hyperthymesia does not increase one's creative thinking. Veiseh claimed to remember almost every day of his life since he was 15 years old, and that his ability to synthesise time and an "encyclopedic knowledge of the history of art" enabled him to create wholly unique visions on canvas. In March 2016 NPR examined further Veiseh's exploration of time and the human experience through art. In 2017, Australian Rebecca Sharrock of Brisbane became known as a person who claims to recall even circumstantial details of every day of her life from her 12th day of life onward. Discussing her hyperthymesia with BBC World Service, Sharrock revealed she was supporting two research projects – one with the University of Queensland and another with the University of California – to understand how a greater knowledge of hyperthymesia can support Alzheimer's disease research, particularly in repairing the degeneration of the hippocampus.
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.
It is a tripeptide rather than a full protein. Proteins generally contain many amino acids joined by alpha-peptide bonds, while glutathione has three residues and an unusual gamma-glutamyl linkage. That structure affects how enzymes recognize and break it down.