A practical reference on epithalamin: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-01-13. Anything still debated is marked as such rather than presented as settled.
Laboratory work has examined effects on telomerase activity in cultured cells, on melatonin rhythms in animals, and on markers of oxidative stress. Some experiments report measurable changes while others show none, and the reported findings rest largely on small studies. The absence of large independent trials means the generality of these results is unresolved rather than settled. Review articles occasionally apply the label geroprotector, a term that reflects a research hypothesis about ageing rather than an established clinical finding.
Epitalon is the common name for a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, usually abbreviated AEDG. All four residues are proteinogenic amino acids, and the free peptide has a calculated mass near 390 grams per mole. Because the chain is short and carries no modifications, it is assembled readily by solid-phase synthesis and is distributed mainly as a freeze-dried solid for laboratory work. Catalogue listings use the spellings epitalon, epithalone, and simply AEDG, and the three refer to the same sequence.
The peptide is a synthetic analogue of epithalamin, a preparation extracted from bovine pineal glands. Investigators sought a short, chemically defined molecule that would reproduce some of the endocrine and gerontological observations attributed to the glandular extract. Proposed mechanisms centre on induction of telomerase activity, an effect reported in cultured human somatic cells in the early 2000s, together with influences on melatonin secretion and neuroendocrine regulation. Those mechanisms remain incompletely characterised, and the reported telomerase response has not been consistently reproduced by independent groups working in comparable systems.
Published work on this compound consists mainly of in vitro experiments, animal studies, and small clinical investigations, a substantial share of which appeared in Russian-language journals. Sample sizes are generally small, control conditions differ between studies, and several endpoints rely on markers whose clinical meaning is itself debated. Reviews of the longevity field treat the peptide as an early example of telomerase-directed research rather than an established intervention. Regulatory treatment varies by country: some jurisdictions place it under prescription controls, others treat it as a laboratory material, and importation may be restricted regardless of local status.
Epitalon is a synthetic tetrapeptide whose sequence is alanine–glutamate–aspartate–glycine, commonly abbreviated AEDG. It was developed in Russia during the 1980s and 1990s by investigators associated with the St. Petersburg Institute of Bioregulation and Gerontology, who studied short peptides as regulators of gene expression and tissue function. The alternative spelling epithalon appears interchangeably in the literature, and the two names refer to the same molecule. Outside Russia it is encountered chiefly as a research chemical rather than a licensed medicine, and it holds no approval from the United States Food and Drug Administration or the European Medicines Agency.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Computed for the free acid of Ala-Glu-Asp-Gly |
| Molecular mass | About 390.35 g/mol | Free peptide; salt forms shift the value |
| Appearance | White to off-white solid | Typical of short peptides after freeze-drying |
| Solubility class | Freely soluble in water | Aqueous buffers are also commonly used |
| Common synonyms | Epitalon, epithalone, AEDG | AEDG is the single-letter sequence |
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.
The Green Berets would become actively involved against the Iranian-backed Special Groups, TF-17 relied a good deal on the Green Berets mentoring teams with the ISOF, the Green Berets placed ODA's in outfits such as the INIS and the Iraqi commando brigade. The ODA's consisted of 20 men and became — during the course of 2007 — the key to coalition operations in provinces such as Dhi Ghar or Maysan, the teams ensured that operations in the Shia militant strongholds had an Iraqi face to them — something of great symbolic importance to the US relationship with the Iraqi government. Green Berets and Polish GROM conducted Operation Jackal against insurgents in Diwaniyah in 2007. During May and June 2007, many Shia arrest operations were conducted by the British SAS and TF-17s Green Berets and Iraqi commandos led to Muqtada al-Sadr to initially flee to Iran, and in August he declared a Mahdi Army ceasefire with the coalition.
18B Special Forces Weapons Sergeant - SGT-SFC 18C Special Forces Engineer Sergeant - SGT-SFC 18D Special Forces Medical Sergeant - SGT-SFC 18E Special Forces Communications Sergeant - SGT-SFC 18F Special Forces Intelligence Sergeant - SSG-SFC 18X Special Forces Candidate 18Z Special Forces Senior Sergeant - MSG-CSM
Glycolysis was the first metabolic pathway discovered: As glucose enters a cell, it is immediately phosphorylated by ATP to glucose 6-phosphate in the irreversible first step. In times of excess lipid or protein energy sources, certain reactions in the glycolysis pathway may run in reverse to produce glucose 6-phosphate, which is then used for storage as glycogen or starch. Metabolic pathways are often regulated by feedback inhibition. Some metabolic pathways flow in a 'cycle' wherein each component of the cycle is a substrate for the subsequent reaction in the cycle, such as in the Krebs Cycle (see below). Anabolic and catabolic pathways in eukaryotes often occur independently of each other, separated either physically by compartmentalization within organelles or separated biochemically by the requirement of different enzymes and co-factors.
Phenibut acts as a full agonist of the GABAB receptor, similarly to baclofen. It has between 30- and 68-fold lower affinity for the GABAB receptor than baclofen, and, in accordance, is used at far higher doses in comparison. (R)-Phenibut has more than 100-fold higher affinity for the GABAB receptor than does (S)-phenibut; hence, (R)-phenibut is the active enantiomer at the GABAB receptor.
Sources: en.wikipedia.org
For instance, knockdown of ACP reduces ceramide levels, whereas loss of the terminal mtFAS enzyme MECR results in ceramide accumulation. Importantly, mtFAS function extends to the regulation of immune cell metabolism. CRISPR/Cas9 screens have identified mtFAS genes—especially Mecr, Mcat, and Oxsm—as key regulators of T cell metabolism. While MECR is not required for naive T cell maintenance, its loss in activated T cells impairs proliferation, survival, and differentiation. MECR deficiency disrupts mitochondrial respiration, alters TCA cycle activity, and increases ferroptosis sensitivity, ultimately reducing T cell fitness and inflammatory capacity.
Ronnie Kasrils, MK's intelligence chief, warned the Soviet mission that if Saluting October proceeded an SADF counteroffensive was imminent. Gusev overruled the Cuban and MK concerns, and the operation commenced without contingency plans for a South African intervention. The preliminary phase of the new offensive began in August 1987. Eight FAPLA brigades deployed to Tumpo, a region to the east of Cuito Cuanavale in early August, where on Soviet advice they temporarily paused for more supplies and reinforcements. This would prove to be a fatal error. On 14 August, having lost days of precious time, FAPLA resumed its efforts to advance; by then South Africa had launched Operation Moduler to halt the offensive. The bloody campaign that followed entailed a series of engagements known collectively as the Battle of Cuito Cuanavale.
nuclear RNA (nRNA) Any RNA molecule located within a cell's nucleus, whether associated with chromosomes or existing freely in the nucleoplasm, including small nuclear RNA (snRNA), enhancer RNA (eRNA), and all newly transcribed immature RNAs, coding or non-coding, prior to their export to the cytosol (hnRNA).
For the second consecutive year, Zverev and Team Germany failed to progress at the United Cup. At the 2026 Australian Open, Zverev progressed to his third consecutive semifinal, defeating Cameron Norrie, Francisco Cerúndolo, and Learner Tien en route. In a rematch of their quarterfinal match in 2024, Zverev lost to eventual champion Carlos Alcaraz in a five-set epic semifinal lasting five hours and 27 minutes, ranking as the third longest match in Australian Open history. During the semifinal, Zverev dropped the first two sets, but rebounded to win the next two in consecutive tiebreaks to push the match to a deciding set, the first deciding set of the men's tournament on Rod Laver Arena. In the fifth set, Zverev had an opportunity to serve for the match, but was broken twice to lose the match. Failing to defend his finalist points from 2025, he dropped to world No. 4 in the rankings, behind Novak Djokovic. In Acapulco, Zverev lost in the second round of singles to Miomir Kecmanovic. However, in doubles, partnered with Marcelo Melo, the pair took the doubles title, defeating Alexander Erler & Robert Galloway in the final. Zverev then made consecutive Masters 1000 semifinals at Indian Wells, Miami, and Monte-Carlo, improving significantly on his results from the previous year. By reaching his first Indian Wells semifinal, he completed the semifinal set of all nine Masters 1000 tournaments, the first person outside of the Big Four to do so.
== Culture and organization == In early times, an ataman (later called hetman) commanded a Cossack band. He was elected by the Host members at a Cossack rada, as were the other important officials: the judge, the scribe, the lesser officials, and the clergy. The ataman's symbol of power was a ceremonial mace, a bulava. Today, Russian Cossacks are led by atamans, and Ukrainian Cossacks by hetmans.
Sources: en.wikipedia.org
It is a four-amino-acid peptide with the sequence alanine-glutamate-aspartate-glycine. The chain is unmodified and contains only standard proteinogenic residues, which makes it straightforward to produce by solid-phase synthesis and to characterise by standard peptide methods.
Epitalon and epithalon both circulate, and the difference reflects transliteration of a name coined in Russian-language publications. Reference to the extract it derives from, epithalamin, explains the shared stem. Databases and suppliers are inconsistent, so a search for one spelling alone may miss relevant entries.
No. Epithalamin is a multi-component preparation obtained from pineal tissue, and its exact composition is not fully characterised. Epitalon is a single defined tetrapeptide described as a short synthetic counterpart of that extract, so the two are related in origin but not interchangeable in identity.
Epitalon is a synthetic four-amino-acid peptide with the sequence alanine–glutamate–aspartate–glycine, also written AEDG. It was developed in Russian gerontology research and is studied for proposed effects on telomerase, melatonin regulation, and neuroendocrine function. It is not an approved pharmaceutical in the United States or the European Union.