A practical reference on epithalamin: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-07-22. Anything still debated is marked as such rather than presented as settled.
Regulatory status varies by country and is not harmonized. Epitalon is not an approved drug in major Western jurisdictions. In some countries it is sold as a research chemical, and in others it has appeared in products marketed for other categories. This inconsistent status means that purity, labeling accuracy, and documentation differ widely between suppliers, and verification of identity and purity through independent analysis is the usual way buyers assess a given lot.
Epitalon appears in the literature primarily through a small number of research groups, most of them associated with the St. Petersburg Institute of Bioregulation and Gerontology. Publications describe cell culture experiments, animal studies, and a limited number of small human studies. Independent replication outside this network is sparse. As a result, reviews of the topic usually separate descriptive reports of observed effects from the question of whether those effects generalize, and they note the difficulty of comparing studies that use different preparations and endpoints.
Analytical characterization of epitalon relies on standard peptide methods. Reverse-phase high-performance liquid chromatography is used to assess purity, and mass spectrometry confirms identity by checking the observed mass against the expected value near 390 daltons. Amino acid analysis can verify composition. Because the peptide is short and hydrophilic, it elutes early on many reverse-phase columns, so method development often requires ion-pairing reagents to achieve adequate retention and resolution from related impurities.
Several names circulate for the same molecule, including epitalon, epithalone, epithalamin tetrapeptide, and the sequence code AEDG. A CAS registry number, 307297-39-8, is commonly cited for it, though catalogue entries should be checked against supplier documentation because mislabelled records occur. In its usual form the peptide carries free amino and carboxyl termini and is neither glycosylated nor lipidated. Researchers distinguish the defined tetrapeptide from epithalamin itself, a crude pineal preparation containing many peptides that is not chemically characterised.
Material supplied for laboratory use is normally a lyophilised white to off-white powder that dissolves readily in water and in isotonic saline. Lyophilised cakes are hygroscopic and should be equilibrated to room temperature before opening to limit condensation on the solid. Solutions are typically prepared at milligram-per-millilitre concentrations and divided into single-use aliquots, because repeated freeze–thaw cycles degrade short peptides. Aqueous solutions are far less stable than the dry powder, and identity is usually verified by mass spectrometry alongside purity estimation from reversed-phase high-performance liquid chromatography.
Epitalon is a synthetic linear tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, abbreviated AEDG. Its molecular formula is C14H22N4O9 and the calculated mass is approximately 390.35 g/mol. The compound is made by solid-phase peptide synthesis rather than extracted from tissue, although early work described it as a short fragment of a peptide fraction obtained from bovine pineal extract. In the research literature the spelling epitalon and the variant epithalone both appear, while AEDG is the standard code used in peptide nomenclature.
| Property | Value | Notes |
|---|---|---|
| Purity assessment | RP-HPLC | Reported as percent area, often ≥95% |
| Identity confirmation | Mass spectrometry | Observed mass compared with ~390 Da |
| Typical storage temperature | -20 °C or below | Lyophilized powder, desiccated |
| Reconstitution solvent | Sterile water or buffer | Acidic residues aid dissolution |
| Common synonyms | AEDG; epithalon | Spelling varies in literature |
The most frequently cited laboratory finding is that AEDG increased telomerase activity and extended telomere length in cultured human somatic cells. That work used fetal fibroblast strains and reported changes in enzyme activity alongside altered division counts. Replication by unrelated groups has been limited, and the published record is largely a single-laboratory series rather than a multi-centre programme. The result supports a hypothesis about peptide influence on gene expression in cell culture; it does not by itself establish an effect on telomere length in living animals or in people.
Animal and clinical reports appear mainly in Russian-language journals from the 1990s and 2000s, covering endpoints such as melatonin rhythm, lifespan in aged rodents, and retinal function. Many of these papers involve small groups, lack blinding or placebo comparison, and are difficult to retrieve through indexed databases. Review articles published in English generally summarise the claims without reanalysing the underlying data. Because no large randomised trial exists, the clinical importance of these reported effects stays unresolved and is properly described as an open question.
No national medicines regulator has approved epitalon as a therapeutic product. It is generally distributed as a research chemical, and in some jurisdictions selling peptides for human consumption without approval is restricted or prohibited. Certificates of analysis accompanying commercial material vary in which tests are performed, and independent verification of identity and purity is uncommon. Statements about anti-ageing or disease-prevention benefits on vendor pages are marketing claims rather than regulatory findings, a distinction that shapes how the compound is discussed in scientific and popular sources alike.
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.
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.
=== Border openings === Finally, at 22:45 (alternatively given as 23:30) on 9 November, Harald Jäger, commander of the Bornholmer Straße border crossing, yielded, allowing guards to open the checkpoints and let people through with little or no identity-checking. As the Ossis swarmed through, they were greeted by Wessis waiting with flowers and champagne amid wild rejoicing. Soon afterward, a crowd of West Berliners jumped on top of the Wall and were soon joined by East German youngsters. The evening of 9 November 1989 is known as the night the Wall came down.
=== Society === Little is revealed of the Combine's activities outside of Earth, but dialogue in Half-Life 2 states that they control worlds of various dimensions inhabited by a range of species. The Combine occupation of Earth is shown to be a brutal totalitarian police state. In City 17, an Eastern European city, Civil Protection units routinely conduct searches of apartment blocks, interrogating human citizens, and engaging in wanton police brutality. The military Overwatch forces of the Combine attack human resistance bases in an effort to further solidify their authority in the urban centers. Human citizens are clad in blue uniforms, living in designated apartment blocks and move around to different cities or locales in passenger trains by the Combine's will. Vortigaunts, enemy alien creatures from Half-Life, have also been enslaved, and are observed in various professions such as janitors. According to Half-Life 2: Raising the Bar, the Combine are draining Earth's oceans and resources to be used on other Combine worlds. The heart of the Combine's command over Earth in Half-Life 2 is the Citadel, a large tower constructed by them which reaches both tens of thousands of feet (several or several tens of kilometres) into the sky and deep underground. Located within City 17, the Citadel serves as the Combine's headquarters on Earth, housing Combine Advisors and the office of Earth's administrator, Dr. Wallace Breen. Breen, a puppet ruler, is frequently seen on large screens around the city on which he spreads propaganda and makes announcements.
In 1987, Yates purchased Temple Gym on Temple Street in Birmingham. In 2006, he franchised four additional Temple Gym locations, three of which are in the UK. As of 2020, only the original Birmingham gym is still in operation; it later relocated from Temple Street to the city's Jewellery Quarter. In 1994, Yates and bodybuilding brothers Mike and Ray Mentzer formed the California-based company Heavy Duty Inc., which marketed athletic apparel and bodybuilding books. In 1998, he partnered with Kerry Kayes to form the bodybuilding supplement company CNP Professional, which marketed a "Dorian Yates Approved" product line in the U.S. He left the company in 2006 to form his own company, Dorian Yates Ultimate Formulas, which offers a line of protein and weight-gain supplements. Yates started a second company in 2010 called EU Peptides, which sells peptide hormones and other pro-hormone supplements. He left this company in 2012, having founded a third company called DY Nutrition in 2011; it specializes in pre-workout formulas, has released several training DVDs, and offers a line of workout related supplements endorsed by Yates.
Negros, like the Central Philippines (Visayas) overall, is generally recognized as a top priority area for wildlife conservation, both in terms of numbers of endemic species and severity of threat. More than half of the critically endangered species listed in the Philippines occur in Negros. It is the most threatened area of the Philippines, since it has the least remaining forest cover with just an estimated 3% remaining. It has the highest numbers of severely threatened endemic species and subspecies. Mt. Silay and Mt. Mandalagan are the two mountain peaks in the Northern Negros Natural Park. These mountains have the last remaining old-growth forests. Negros shares a lot of its fauna with Panay. Due to high amounts of deforestation most of these Western Visayan endemics are threatened. These include the white-winged cuckooshrike, Visayan flowerpecker, flame-templed babbler, writhed-billed hornbill, Visayan tarictic hornbill, Negros bleeding-heart pigeon, Visayan rhabdornis, Negros scops owl, Visayan spotted deer and Visayan warty pig The Negros striped babbler and the possibly extinct Negros fruit dove are only found on the island and nowhere else. Other threatened species include Blue-backed parrot, Pinsker's hawk-eagle, Pink-bellied imperial pigeon, Green-faced parrotfinch and the possibly extinct subspecies of Celestial monarch and Spotted imperial pigeon.
Sources: en.wikipedia.org
Terry Peter Gallagher as Axel Zufo, a fossil fuels billionaire Billy Eichner as Waylen Lemming, a crypto billionaire David Pittu as Ronan Wylde, a banking billionaire Julie Halston as Kitty Munson, a multinational retail billionaire Matthew Laureano as Nate, a victim who is tortured and killed by the Assassin and Jeremy Rev Yolanda as Clara Gardner, a transgender scientist and Mike's best friend Lux Pascal as Clara after the transformation Laura Dreyfuss as Jennifer King Robert Harrington as Jefferson, Byron's bodyguard Kelli O'Hara as Juliana Williams, Meyer's wife Hazel Graye as Juliana after the transformation Kaylee Halko as Joey, the teenage daughter of Meyer and Juliana who has progeria Augusta Liv as Joey after the transformation Kevin Cahoon as Tiger "Tig" Forst, one of Byron and Franny's sons Ray Nicholson as Tig after the transformation Eric Petersen as Gunther Forst, one of Byron and Franny's sons Brandon Gillard as Gunther after the transformation Anthony Rapp as a Scientist who worked for the space colonization division of Byron's corporation Emma Halleen as Bella Grant, a school student who becomes fixated on the "Beauty" Annabelle Wachtel as Ruthie, Bella's best friend who is lamenting a failed nose job Paige McGarvin as Ruthie after the transformation Maria Dizzia as Marcy Grant, Bella's mother Daniel Stewart Sherman as Bella's father Carson Rowland as Conor, an employee of Byron's corporation who administers doses of the "Beauty" Ethan Eisenstein as Conor before the transformation Red Concepcion as Sir Ma'am, a social media influencer Sky Kawai as Sir Ma'am after the transformation
As HVEC shifted into conglomerate model, its subsidiary Electronized Chemicals Corporation began producing in-house products with HVEC devices. By 1960, ECC had introduced product lines in heat-shrink tubing, shrink wrap, and cross-linked wiring. In the late 1970s, piggybacking on research projects led by John Trump, HVEC expanded into environmental applications of electron beam technology. In 1980, the company received a $1 million contract from Miami-Dade County for electron beam equipment to disinfect wastewater before discharge to sanitary landfills. The company also received contracts to expand a prototype sewage sludge treatment plant for the Massachusetts Metropolitan District Commission and to develop an electron beam system for poultry feed disinfection.
==== Reception ==== Patrick Anderson of the Washington Post has praised McKinty as a leading light of the "new wave" of Irish crime novelists along with Ken Bruen, Declan Hughes and John Connolly. He often uses the classic noir tropes of revenge and betrayal to explore his characters' existential quest for meaning in a bleak but lyrically intense universe. Steve Dougherty writing in The Wall Street Journal praised McKinty's use of irony and humour as a counterpoint to the violent world inhabited by McKinty's Sean Duffy character. Liam McIlvanney, writing in the Irish Times, singled out McKinty's lyrical prose style as the defining characteristic of the Duffy series. Some reviewers have criticised the explicit use of violence in his novels. However, in reviewing McKinty's Fifty Grand in The Guardian, John O'Connor called him a "master craftsman of violence and redemption, up there with the likes of Dennis Lehane." His novel The Dead Yard was selected by Publishers Weekly as one of the 12 Best Novels of 2006. Audible selected Falling Glass as the Best Mystery or Thriller of 2011. In the Morning I'll Be Gone was named as one of the 10 best crime novels of 2014 by the American Library Association. In 2016, The Guardian included book 5 of the Sean Duffy series, Rain Dogs, about the investigation of a death at Carrickfergus Castle, in their "The best recent thrillers" coverage.
Sources: en.wikipedia.org
Identity is normally confirmed by mass spectrometry, which checks the measured mass against the expected value near 390 daltons. Reverse-phase high-performance liquid chromatography is used alongside it to assess purity. Amino acid analysis can provide additional composition data.
The powder is generally kept refrigerated or frozen, protected from light and moisture. Vials should reach room temperature before opening to prevent condensation. Reconstituted solutions are usually stored cold and used within a limited window because dilute solutions can degrade or support microbial growth.
Epitalon is not an approved drug in major Western regulatory jurisdictions. Its legal status differs between countries, and it is often distributed as a research chemical. This means product documentation and purity vary considerably between suppliers.
It is a synthetic tetrapeptide. Its sequence was derived from research on peptide fractions of bovine pineal extract, and the intact AEDG sequence has not been demonstrated as an abundant free peptide in human tissue.