Epithalamin is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2026-05-22. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
The most frequently cited proposed action is induction of telomerase, the enzyme that adds repeat sequences to chromosome ends. Cell-culture work from the originating group reported higher telomerase reverse transcriptase expression and measurable telomere elongation in human somatic cells after exposure. How a four-residue peptide would reach nuclear gene regulation is not established, and no cell-surface receptor or uptake route has been identified. Additional reports describe changes in melatonin secretion, antioxidant enzyme activity and lipid peroxidation in aged animals, but these findings remain mechanistically unconnected to the telomerase observation.
The compound is described in the literature as a derivative of epithalamin, a preparation obtained from bovine pineal tissue. Work on this peptide family was carried out mainly by a research group in Saint Petersburg beginning in the 1980s, and the substance was later registered for clinical use in Russia under the name Epitalon. Outside that region it is generally treated as a research chemical rather than an approved medicine. Statements about its biological activity rest on a relatively small number of studies, and independent replication remains limited.
In its supplied form epitalon is a white to off-white powder, usually lyophilized and often hygroscopic. It dissolves readily in water and in aqueous buffers, and it is commonly handled as the acetate or trifluoroacetate salt to improve stability during purification and drying. The amide backbone is labile in aqueous media, so solutions are less durable than the dry solid. Handling notes in the chemical literature therefore emphasize keeping the powder dry, cool and shielded from light until it is dissolved.
Epitalon is a synthetic tetrapeptide whose sequence is alanine-glutamate-aspartate-glycine, written in single-letter code as AEDG. The four residues are joined by three peptide bonds, giving a linear backbone with no branching and no disulfide bridges. Its calculated molecular mass for the free form is approximately 390.3 daltons, a figure that rises when the compound is supplied as an acetate or trifluoroacetate salt. Because the chain is short, the molecule is defined entirely by its residue order rather than by any folded three-dimensional structure.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Calculated from the four residues with three water losses |
| Molecular mass | About 390.35 g/mol | Monoisotopic mass near 390.14, used for mass-spectrometric identification |
| Peptide sequence | Ala-Glu-Asp-Gly | Single-letter form AEDG; no disulfide bonds or modified residues |
| Appearance | White to off-white solid | Supplied as a dried powder |
| Isoelectric point | Around 4 | Estimated from aspartate and glutamate side-chain pKa values |
（TG:@pojiaai）Epitalon is a synthetic linear tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, abbreviated AEDG. It emerged from work on epithalamin, a peptide fraction prepared from bovine pineal tissue, and was designed as a short, chemically defined analogue of that extract. Early publications came mainly from Russian laboratories studying pineal peptides and aging-related endpoints. The compound appears in the literature under several spellings, including epithalon and epithalone, which complicates systematic searching. Its small size makes solid-phase assembly and routine analytical characterization straightforward.
Chemically, the molecule consists of four amino acid residues joined by three peptide bonds, with a free N-terminal amino group and a free C-terminal carboxyl group. Its molecular formula is C14H22N4O9, and its monoisotopic mass is approximately 390 daltons. The acidic glutamate and aspartate side chains give the peptide a net negative charge near neutral pH, a property that shapes its chromatographic behaviour and solubility profile. No disulfide bridges or other post-translational modifications are present, so the primary sequence alone defines the structure.
Most experimental work has been carried out in cell culture and animal models. Several reports describe changes in telomerase activity and proliferation in cultured cells, while rodent studies have examined lifespan, melatonin rhythm and reproductive endpoints. Human data remain limited, and much of the published clinical material consists of small trials with incomplete reporting of methods and controls. Whether the cell and animal findings translate into measurable effects in people is an open question, and the mechanistic basis of the reported telomerase changes is not fully established.
=== Jcom radio libel case === In November 2007, Jewish radio station Jcom aired a satirical segment in which a character named 'Georgie Galloway' used the anti-Semitic catchphrase "kill the Jews, kill the Jews". Galloway sued the station for libel and won the case in the High Court. Galloway was awarded £15,000 in damages and around £5,000 in costs. The radio station closed after losing the case. Galloway said the judgment had "categorically crushed the slur of anti-Semitism" against him.
=== Chemical industry === Stainless-steel belts are part of continuous production processes. Unlike conveyor belts used purely for transportation purposes, steel belts used in this industry serve as media for transferring heat and/or pressure. Applications for steel belts in the chemical industry include casting, polymerizing of resins, waxes, paraffins and many other substances.
Physical optics: The intensity of electromagnetic radiation such as light or X-rays or gamma rays in an absorbent medium, follows an exponential decrease with distance into the absorbing medium. This is known as the Beer-Lambert law. Radioactivity: In a sample of a radionuclide that undergoes radioactive decay to a different state, the number of atoms in the original state follows exponential decay as long as the remaining number of atoms is large. The decay product is termed a radiogenic nuclide. Thermoelectricity: The decline in resistance of a Negative Temperature Coefficient Thermistor as temperature is increased. Vibrations: Some vibrations may decay exponentially; this characteristic is often found in damped mechanical oscillators, and used in creating ADSR envelopes in synthesizers. An overdamped system will simply return to equilibrium via an exponential decay. Beer froth: Arnd Leike, of LMU Munich, won an Ig Nobel Prize for demonstrating that beer froth obeys the law of exponential decay. Automobile braking is a universal example of exponential decay, and variation of the mathematical exponentials and functions which the foot applies are important to the comfort of the occupants and the avoidance of accidents.
Both the δDs of sea water and the fractionations associated with hyptophyte biochemistry (εbio) are fairly well understood, so alkenones can be readily used to observe the secondary effect of salinity on δD. There is a well established positive linear correlation between salinity and εl/w, on the order of a ~3‰ change in fractionation per salinity unit. Hypothesized mechanisms for this effect include enrichment of D in intracellular water due to reduced exchange with extracellular water at higher salinity, removal of H from intracellular water due to increased production of solutes to maintain osmotic pressure at higher salinity, and lower haptophyte growth rates at higher salinity Alkenone δDs have been used successfully to reconstruct past salinity changes in the Mediterranean Sea, Black Sea, Panama Basin, and Mozambique Channel. As an extension of salinity, this data was also used to draw further conclusions about ancient environments, such as ancient freshwater flooding events, and the evolution of plankton in response to environmental changes
Sources: en.wikipedia.org
Although mild hypokalemia does not cause distinct symptoms, it is a risk factor for hypertension and cardiac arrhythmia. Severe hypokalemia usually presents with hypertension, arrhythmia, muscle cramps, fatigue, weakness and constipation. Causes of hypokalemia include vomiting, diarrhea, medications like furosemide and steroids, kidney dialysis, diabetes insipidus, hyperaldosteronism, and hypomagnesemia.
== Dietary issues == Leaf protein is a good source of amino acids, with methionine being a limiting factor. It is nutritionally better than seed proteins and comparable to animal proteins (other than those in egg and milk). In terms of digestibility, whole LPC has digestibility in the range 65–90%. The green fraction has a much lower digestibility that may be <50%, while the white fraction has digestibility >90%. The challenges that have to be overcome using lucerne and cassava, two high density monoculture crops, include the high fiber content and other antinutritional factors, such as phytate, cyanide, and tannins. Lablab beans, Moringa oleifera, tree collards and bush clover may also be used. Flavors of different species vary greatly. For testing new leaf species for use as LPCs a non-targeted approach has been developed that uses an ultra-high-resolution hybrid ion trap orbitrap mass spectrometer with electrospray ionization coupled to an ultra-high pressure two-dimensional liquid chromatograph system. An open source software toolchain was also developed for automated non‐targeted screening of toxic compounds for LPCs. The process uses three tools: 1) mass spectrometry analysis with MZmine 2, 2) formula assignment with MFAssignR, and 3) data filtering with ToxAssign. Studies have looked at the potential for deciduous trees and coniferous tree leaves.
He beat Andrey Rublev for the 17th title of his career and the fourth of the season, in 59 minutes, the shortest match in the tournament history. At the US Open, Zverev sought to claim his first major title following his run to the final the previous year. He reached the semifinals following wins over Jack Sock and Lloyd Harris. There, he lost to Novak Djokovic in five sets despite taking the first set, ending his career-high 16-match win streak stretching back to the Olympics. Zverev was seeded 3rd at the 2021 BNP Paribas Open, where he reached the quarterfinals. On the way, he defeated Jenson Brooksby, Andy Murray and Gaël Monfils. He lost to Taylor Fritz, despite having two match points. At the Erste Bank Open in Vienna, seeded second, he defeated Filip Krajinović and Alex de Minaur to reach the quarterfinals. The victory over De Minaur gave Zverev his 300th ATP tour match win. He then beat Félix Auger-Aliassime and Carlos Alcaraz to reach the final where he won his fifth title of the year and 18th overall, defeating Frances Tiafoe in straight sets. Zverev was the fourth seed at the 2021 Rolex Paris Masters. He received a bye into the second round, where he defeated Dušan Lajović. He defeated next sixteenth seed Grigor Dimitrov in the third round and sixth seed Casper Ruud in the quarterfinals. He lost in the semifinals to second seed Daniil Medvedev in straight sets. As a result of this run he equaled his singles career-high ranking of World No. 3 on 8 November 2021. For a fifth successive season, Zverev qualified for the 2021 ATP Finals in Turin, as the third seed.
Medical treatment of gynecomastia that has persisted beyond two years is often ineffective. Gynecomastia is different from "pseudogynecomastia", which is commonly present in men with obesity. Medications such as aromatase inhibitors are effective, even in rare cases of gynecomastia from disorders such as aromatase excess syndrome or Peutz–Jeghers syndrome, but surgical removal of the excess tissue can be needed to correct the condition. In 2019, 24,123 male patients underwent the procedure in the United States, accounting for a 19% increase since 2000.
=== Oxytalan fibers === Oxytalan fibers are unique to the PDL and are elastic in nature. It inserts into cementum and runs in two directions: parallel to root surface and oblique to root surface. The function is thought to maintain the patency of blood vessels during occlusal loading. Further research is needed to determine the function of oxytalan fibers.
Sources: en.wikipedia.org
== History == In 1962, Stanozolol was brought to market in the US by Winthrop under the tradename "Winstrol" and in Europe by Winthrop's partner, Bayer, under the name "Stromba". Also in 1962, the Kefauver Harris Amendment was passed, amending the Federal Food, Drug, and Cosmetic Act to require drug manufacturers to provide proof of the effectiveness of their drugs before approval. The FDA implemented its Drug Efficacy Study Implementation (DESI) program to study and regulate drugs, including stanozolol, that had been introduced prior to the amendment. The DESI program was intended to classify all pre-1962 drugs that were already on the market as effective, ineffective, or needing further study. The FDA enlisted the National Research Council of the National Academy of Sciences to evaluate publications on relevant drugs under the DESI program. In June 1970 the FDA announced its conclusions on the effectiveness of certain AAS, including stanozolol, based on the NAS/NRC reports made under DESI. The drugs were classified as probably effective as adjunctive therapy in the treatment of senile and postmenopausal osteoporosis but only as an adjunct, and in pituitary dwarfism (with a specific caveat for dwarfism, "until growth hormone is more available"), and as lacking substantial evidence of effectiveness for several other indications.
5-20 May Operation Daring Rebel was conducted by the ARVN 2nd Division, ROK 2nd Marine Brigade and U.S. forces to seek out and destroy VC rest camps on Barrier Island south of Hội An. The operation resulted in 105 VC and two U.S. killed.
== Controversies == In May, 2014, it was announced that The Psychemedics Corporation would be providing hair testing services to three private Cleveland-area schools. Journalists quickly noted a severe conflict of interest, as James Kubacki, Principal of St. Edward's High School, is the brother of Raymond Kubacki, CEO of The Psychemedics Corporation. The Plain Dealer noted that this fact was not disclosed to parents, revealing that it "wasn't stated at the institution-wide meetings to discuss with students their soon-to-be-curtailed privacy." This is not the first time that The Psychemedics Corporation has been scrutinized for questionable business tactics, having previously hired the high ranking employees of their clients. "Dr. George Elder, a principal for decades, says he instituted drug testing for all students and faculty members at his school. Now he's Psychemedics vice president and pitchman."
==== Flowering ==== Blooms occur when the day length becomes shorter than 12 hours (beginning in mid-October in some places), necessitating the use of shade cloth in urban environments with exposure to light pollution caused by HPS lighting. Both Siebert and hobbyist reports indicate that viable seeds can, on occasion, be produced under cultivation, following hand-pollination or hummingbird pollination.
Sources: en.wikipedia.org
No. Epithalamin is a peptide-containing extract of bovine pineal glands, while epitalon is a single synthetic tetrapeptide. The extract contains many peptides and other tissue components, so its composition varies between batches in ways that a synthesised sequence does not.
It is not recognised as an endogenous peptide hormone. The four-residue sequence can appear inside larger proteins and in digestive fragments of dietary protein, but no dedicated pathway producing it as a signalling molecule has been identified.
Several cell-culture reports describe increased telomerase activity after treatment, measured by enzyme assays or by transcript levels. Results differ between cell types and laboratories, and measured telomere lengthening has been reported in some studies but not in others, which leaves the physiological relevance open.
The peptide contains four residues in the order alanine, glutamate, aspartate and glycine, abbreviated AEDG. The chain is linear and held together by three peptide bonds. Its calculated mass for the uncharged free form is about 390.3 daltons.