If you have been reading about AEDG and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2025-10-14. Where a claim depends on a specific study, the study is described rather than over-claimed.
Literature searches for this compound must account for several spelling variants. Indexing databases contain epitalon, epithalon, epithalone, and AEDG, and relevant records are scattered across Russian-language and English-language journals that do not consistently cross-cite. Early publications describe the parent extract as a mixture of many peptides, whereas later work addresses the single synthetic tetrapeptide. That shift in nomenclature complicates comparison between studies, because extract data and tetrapeptide data are sometimes cited interchangeably. A search strategy omitting the alternate spellings will return an incomplete set of references.
Reported biological findings come mainly from cell culture and rodent experiments. Those studies describe changes in telomerase catalytic subunit expression, melatonin rhythm amplitude, and antioxidant enzyme activity after peptide exposure. Human data are sparse and consist of small trials with limited blinding and inconsistent endpoints. The proposed mechanisms remain hypotheses rather than established facts, and there is no consensus on whether effects observed in animals carry over to people. Independent replication outside the original research groups is limited, which is a recognised gap in the published literature.
The parent extract epithalamin was characterised as a low-molecular-weight fraction of pineal tissue rather than a single defined chemical entity. Researchers fractionated it and tested successive fragments for activity, a screening approach typical of peptide discovery work in that era. Epitalon emerged from that process as one of the shorter sequences of interest. Because the original extract was never fully resolved into individual components, claims about which constituent drives a given effect rest on inference. This distinction matters when reading older reports that attribute extract observations to the tetrapeptide itself.
The proposed relationship between epitalon and pineal function is a central part of its background. Khavinson's group reported that short peptides corresponding to regions of larger pineal proteins could influence gene expression in cells. Epitalon was framed as a synthetic analogue of an active fragment rather than a direct isolation product. Whether the tetrapeptide reproduces the effects of the parent extract is an open question, because comparative studies are limited and the parent extract itself is not a single defined substance.
Interest in epitalon is usually discussed within the broader field of short peptide bioregulators, a category that includes other synthetic di-, tri-, and tetrapeptides studied by the same research group. These compounds share a common rationale: that small fragments of tissue-derived proteins can retain biological activity and can be produced reproducibly. The category as a whole remains outside mainstream pharmacological consensus, and epitalon specifically has a limited presence in independent, non-Russian research literature, which shapes how its evidence base is described.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic tetrapeptide | Four amino acid residues |
| Residue sequence | Ala-Glu-Asp-Gly | Abbreviated AEDG |
| Approximate mass | 390.35 Da | Monoisotopic, free base form |
| Parent preparation | Epithalamin extract | Derived from pineal tissue |
| Common spelling variants | Epithalon, epithalone, AEDG | Affects literature retrieval |
Residue composition is the property that most cleanly separates verified material from mislabelled samples. Alanine, glutamate, aspartate and glycine appear in that order from the N-terminus, and the two acidic residues sit in the middle of the chain. Because the peptide is short, it can be produced by solid-phase synthesis and characterised by mass spectrometry without ambiguity. Any reported sample whose measured mass departs substantially from 390 daltons is a different compound or a degraded mixture rather than epitalon.
Epitalon is a synthetic tetrapeptide whose four residues are alanine, glutamate, aspartate and glycine, commonly abbreviated AEDG. Its molecular formula is C14H22N4O9 and its monoisotopic mass is near 390.35 daltons. The peptide carries two acidic side chains, so it is neutral to negatively charged in most aqueous buffers. Published reference summaries usually list it under both spellings, epitalon and epithalon, and treat the two names as the same material.
The compound is generally described as a synthetic analogue of a fragment isolated from a pineal gland extract. Researchers associated with the Saint Petersburg Institute of Bioregulation and Gerontology introduced it during the 1980s and 1990s while studying short peptides from animal tissue. The original extract, called epithalamin, is a heterogeneous mixture, whereas epitalon is a single defined sequence. That distinction matters because findings reported for the extract are not automatically findings about the pure tetrapeptide, and claims about broader biological effects remain a separate question from the chemical identity described here.
Published evidence comes mainly from Russian-language journals and from a single research group, with small sample sizes and limited independent replication. A few laboratories outside that group have examined related peptides and reported weaker or absent telomerase effects, so the central claim is best described as contested rather than settled. Rodent studies report modest changes in some ageing markers and in survival, but designs vary and control conditions are often sparse. No large randomised trial in humans has been published, and long-term safety data in healthy populations are correspondingly thin.
Epitalon is a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. It was designed at the St. Petersburg Institute of Bioregulation and Gerontology as a short, chemically defined analogue of epithalamin, a fraction obtained from bovine pineal tissue. Small peptide bioregulators of this type formed a long-running line of work there from the 1980s onward. Because the molecule is produced by solid-phase synthesis rather than extraction, its composition is exact and its purity can be measured directly.
Published studies on epitalon are dominated by a small number of research groups, and independent replication in other laboratories remains limited. Proposed mechanisms include activation of telomerase and modulation of melatonin rhythms, but the evidence for either rests mainly on cell cultures and animal models. Whether the peptide produces comparable effects in humans is an open question, and the absence of large controlled trials means the literature is best read as exploratory rather than settled.
Epitalon is a synthetic four-amino-acid peptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its molecular formula is C14H22N4O9, and its calculated molar mass is approximately 390.35 grams per mole. The compound is a short fragment related to a peptide fraction isolated from bovine pineal gland extracts, and it is normally supplied as a lyophilised powder intended for laboratory research. It is not a registered pharmaceutical product in most countries.
The peptide emerged from research carried out in Saint Petersburg from the late 1980s onward, where investigators searched for shorter active fragments of a pineal preparation known as epithalamin. The name epitalon was chosen to reflect that parent extract. Early reports described effects on neuroendocrine markers and on the lifespan of laboratory animals. Much of that work appeared in Russian-language journals, with English translations following later, which affects how readily the original protocols can be assessed by outside groups.
On 12–13 December 1981, the regime declared martial law in Poland, under which the army and the ZOMO special police forces were used to crush Solidarity. The Soviet leaders insisted that Jaruzelski pacifies the opposition with the forces at his disposal, without Soviet involvement. Almost all Solidarity leaders and many affiliated intellectuals were arrested or detained. Nine workers were killed in the Pacification of Wujek. The United States and other Western countries responded by imposing economic sanctions against Poland and the Soviet Union. Unrest in the country was subdued, but continued. During martial law, Poland was ruled by the so-called Military Council of National Salvation. The open or semi-open opposition communications, as recently practiced, were replaced by underground publishing (known in the eastern bloc as Samizdat), and Solidarity was reduced to a few thousand underground activists. Having achieved some semblance of stability, the Polish regime relaxed and then rescinded martial law over several stages. By December 1982 martial law was suspended and a small number of political prisoners, including Wałęsa, were released. Although martial law formally ended in July 1983 and a partial amnesty was enacted, several hundred political prisoners remained in jail. Jerzy Popiełuszko, a popular pro-Solidarity priest, was abducted and murdered by security functionaries in October 1984.
Cristalino [kɾistaˈlino] ("crystalline"): aged tequila that has been filtered to remove its color before bottling, similar to chill filtering of whisky Rosa ("pink"): a young version of the spirit "lightly aged in red wine barrels"
Thromboembolism – embolism of thrombus or blood clot. Cholesterol embolism - embolism of cholesterol, often from atherosclerotic plaque inside a vessel. Fat embolism – embolism of bone fracture or fat droplets. Air embolism (also known as a gas embolism) – embolism of air bubbles. Septic embolism – embolism of pus containing bacteria. Cancer embolism In contrast, amniotic fluid embolism almost exclusively affects the venous side.
The fruit bodies of Boletus edulis can grow singly or in small clusters of two or three specimens. The mushroom's habitat consists of areas dominated by pine (Pinus spp.), spruce (Picea spp.), hemlock (Tsuga spp.) and fir (Abies spp.) trees, although other hosts include chestnut, chinquapin, beech, Keteleeria spp., Lithocarpus spp., and oak. In California, porcini have been collected in a variety of forests, such as coastal forests, dry interior oak forests and savannas and interior high-elevation montane mixed forests, to an altitude of 3,500 m (11,500 ft). In northwestern Spain, they are common in scrublands dominated by the rock rose species Cistus ladanifer and Halimium lasianthum. In the Midi region of south-west France, they are especially favoured and locally called cèpe de Bordeaux after the town from which they are traded to the north and abroad. Boletus edulis has a cosmopolitan distribution, concentrated in cool-temperate to subtropical regions. It is common in Europe—from northern Scandinavia, south to the extremities of Greece and Italy—and North America, where its southern range extends as far south as Mexico. It is well known from the Borgotaro area of Parma, Italy, and has PGI status there. The European distribution extends north to Scandinavia and south to southern Italy and Morocco. In North America, it can be found from May to October inland and August to January on the West Coast. In China, the mushroom can be found from the northeastern Heilongjiang to the Yunnan–Guizhou Plateau and Tibet.
Sources: en.wikipedia.org
Britain's first response to Napoleon's Continental System was to launch a major naval attack against Denmark. Although ostensibly neutral, Denmark was under heavy French and Russian pressure to pledge its fleet to Napoleon. London could not take the chance of ignoring the Danish threat. In August 1807, the Royal Navy besieged and bombarded Copenhagen, leading to the capture of the Dano–Norwegian fleet, and assuring use of the sea lanes in the North and Baltic seas for the British merchant fleet. Denmark joined the war on the side of France, but without a fleet it had little to offer, beginning an engagement in a naval guerrilla war in which small gunboats attacked larger British ships in Danish and Norwegian waters. Denmark also committed themselves to participate in a war against Sweden together with France and Russia. At Tilsit, Napoleon and Alexander had agreed that Russia should force Sweden to join the Continental System, which led to a Russian invasion of Finland in February 1808, followed by a Danish declaration of war in March. Napoleon also sent an auxiliary corps, consisting of troops from France, Spain and Holland, led by Marshal Jean-Baptiste Bernadotte, to Denmark to participate in the invasion of Sweden. But British naval superiority prevented the armies from crossing the Øresund strait, and the war came mainly to be fought along the Swedish–Norwegian border.
== A == a-actinin Abl ABLIM Actin-Interacting MAPKKK Ssk2p ABP120 ABP140 Abp1p ABP280 (Filamin) ABP50 (EF-1a) Acan 125 (Carmil) ActA Actibind Actin Actinfilin Actinogelin Actin-regulating kinases Actin-Related Proteins Actobindin Actolinkin Actopaxin Actophorin Acumentin (= L-plastin) Adducin ADF/Cofilin Adseverin (scinderin) Afadin AFAP-110 Affixin Aginactin AIP1 Aldolase Angiogenin Anillin Annexins Aplyronine Archvillin (isoform of Supervillin) Arginine kinase Arp2/3 complex
== Function == Trypsinogen is the proenzyme precursor of trypsin. Trypsinogen (the inactive form) is stored in the pancreas so that it may be released when required for protein digestion. The pancreas stores the inactive form trypsinogen because the active trypsin would cause severe damage to the tissue of the pancreas. Trypsinogen is released by the pancreas into the second part of the duodenum, via the pancreatic duct, along with other digestive enzymes.
Following the Treaty of Ryswick of 1697, Hispaniola was divided between France and Spain. France received the western third and subsequently named it Saint-Domingue. To develop it into sugarcane plantations, the French imported thousands of slaves from Africa. Sugar was a lucrative commodity crop throughout the 18th century. By 1789, approximately 40,000 white colonists lived in Saint-Domingue. The whites were vastly outnumbered by the tens of thousands of African slaves they had imported to work on their plantations, which were primarily devoted to the production of sugarcane. In the north of the island, slaves were able to retain many ties to African cultures, religion and language; these ties were continually being renewed by newly imported Africans. Blacks outnumbered whites by about ten to one. The French-enacted Code Noir ("Black Code"), prepared by Jean-Baptiste Colbert and ratified by Louis XIV, had established rules on slave treatment and permissible freedoms. Saint-Domingue has been described as one of the most brutally efficient slave colonies; one-third of newly imported Africans died within a few years. Many slaves died from diseases such as smallpox and typhoid fever. They had birth rates around 3 percent, and there is evidence that some women aborted fetuses, or committed infanticide, rather than allow their children to live within the bonds of slavery.
== Climate == Climate Change Performance Index (CCPI) 2020: Of 57 nations responsible for about 90% of global energy-related CO2 emissions, Thailand was ranked 33rd, "poor". Other ASEAN nations ranked were Indonesia, 39 "poor" and Malaysia, 53 "very poor". Among other findings, Thailand's population and greenhouse gas (GHG) emissions continue to rise and its climate policy is "poor". Germanwatch's Global Climate Risk Index 2019 analyzes the extent to which countries have been affected by climate risks—impacts of weather-related loss events (storms, floods, heat waves, etc.). The most recent data available, for 2017 and from 1998 to 2017, are the basis of the report, which uses an algorithm based on deaths and financial losses. For the period 1998–2017, Thailand ranked 13 of 181 nations (1=most affected; 181=least affected). Other ASEAN nations were ranked: Myanmar, 3; Philippines, 5; Vietnam, 9; Cambodia, 19; Indonesia, 69; Laos, 89; Malaysia, 116; Brunei, 175; Singapore, 180. In 2019, YouGov surveyed 30,000 citizens in 28 nations about their views on climate change and the role of humans, if any, in causing it. Sixty-nine percent of Thais thought that the climate is changing and that humans were mostly responsible for it. Most of the people of other ASEAN nations surveyed were largely in agreement: Indonesia, 69%; Vietnam, 64%; Philippines, 62%; Singapore, 54%; and Malaysia, 48%. Global Climate Risk Index 2018: Thailand was ranked ninth on a list of countries most affected by extreme weather events during the period 1997–2016.
Sources: en.wikipedia.org
==== Basic metabolic studies ==== Biochemical studies are performed to screen for imbalances of metabolites in the bodily fluid, usually the blood (plasma/serum) or urine, but also in cerebrospinal fluid (CSF). Specific tests of enzyme function (either in leukocytes, skin fibroblasts, liver, or muscle) are also employed under certain circumstances. In the US, the newborn screen incorporates biochemical tests to screen for treatable conditions such as galactosemia and phenylketonuria (PKU). Patients suspected to have a metabolic condition might undergo the following tests:
ESAC technology has been used for the isolation of potent inhibitors of bovine trypsin and for the identification of novel inhibitors of stromelysin-1 (MMP-3), a matrix metalloproteinase involved in both physiological and pathological tissue remodeling processes, as well as in disease processes, such as arthritis and metastasis.
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Droëwors – a Southern African snack food, based on the traditional, coriander-seed spiced boerewors sausage. Droge worst, Dutch snack food Dambu nama, Northern Nigerian dried meat floss, made with beef and chicken
Sources: en.wikipedia.org
It is based on epithalamin, a peptide-rich preparation obtained from pineal gland tissue and studied in the former Soviet Union. Researchers later identified the tetrapeptide AEDG as a constituent fragment of that material. Modern supplies are produced by chemical synthesis rather than tissue extraction.
No. Epithalamin is a heterogeneous extract containing many peptides, while epitalon is a single synthesised tetrapeptide. Publications sometimes treat findings from the two as equivalent, which is a common source of confusion. Their compositions differ and they are not interchangeable in analytical terms.
Most published work uses cell cultures or rodents because those models are faster and less costly to run. The few human trials that have been reported are small, and several lack control groups or blinding. This restricts what can reasonably be concluded about effects in people.
Epitalon is a synthetic tetrapeptide composed of four amino acids: alanine, glutamate, aspartate, and glycine. It is written as Ala-Glu-Asp-Gly. The free peptide has a molecular weight of about 390 daltons and is normally supplied as a lyophilized powder.