This is a working overview of AEDG, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-10-18. Anything still debated is marked as such rather than presented as settled.
Material sold for research use varies widely in documented quality. A useful verification package includes a certificate of analysis that states peptide content rather than only net weight, the chromatographic method and column used, and a mass spectrum consistent with the expected mass. Independent testing by a third-party laboratory is occasionally reported. Statements of identity resting only on a supplier label provide little assurance, and the gap between nominal mass and actual peptide content can be substantial once counterions and residual water are counted.
Peptides of this size are generally stable as dry solids but degrade in solution over time. The principal routes are hydrolysis of the peptide backbone and oxidation, with hydrolysis favoured by elevated temperature and extreme pH. Aqueous solutions held at room temperature can show measurable loss of purity within days, while frozen aliquots are considerably more durable. Because the sequence contains neither cysteine nor methionine, oxidation is less of a concern than for many other peptides, but pH control during handling still matters.
The compound is generally presented as a synthetic fragment of epithalamin, a pineal gland extract investigated in the former Soviet Union from the 1970s onward. Vladimir Khavinson and colleagues in Saint Petersburg developed short peptides modelled on such extracts, and epitalon became the most widely cited of those sequences. Most primary reports appeared in Russian-language journals or in proceedings with limited international circulation. Independent replication in laboratories outside that network remains sparse, and much repeated secondary material traces back to a small number of originating groups.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Lyophilized solid |
| Solubility | Freely soluble in water | Also dissolves in polar organic solvents |
| Typical storage temperature | −20 °C or below | Sealed, desiccated, protected from light |
| Primary purity assay | Reversed-phase HPLC | Ultraviolet detection near 214 nm |
| Identity confirmation | Mass spectrometry | Electrospray ionization commonly used |
Identity and purity of epitalon samples are normally established by reversed-phase high-performance liquid chromatography with ultraviolet detection near 214 nanometres, combined with mass spectrometry. The mass spectrum confirms the expected molecular ion and can reveal truncated or oxidised by-products. Amino acid analysis after acid hydrolysis verifies that the four residues are present in the expected ratio. Certificates typically report a purity figure taken from chromatographic peak area, expressed as a percentage of total integrated signal.
Lyophilised epitalon is generally held at minus twenty degrees Celsius in a sealed container kept dry and dark. Cooler conditions are sometimes recommended for long-term archives. The solid takes up moisture readily enough that repeated opening of a vial introduces water, so dividing a batch into smaller portions before storage lowers degradation risk. Aqueous solutions are less durable than the dry powder and are usually prepared shortly before use, then kept cold and shielded from light to slow hydrolysis and oxidation.
Verification of research-grade material involves comparing a supplier chromatogram against an in-house reference, checking the observed mass against the calculated value, and where possible confirming residue order by tandem mass spectrometry or enzymatic peptide mapping. Purity claims should be read alongside the method used to obtain them, because detection wavelength and integration settings alter the result. Batch-specific data, rather than a generic grade statement, is the informative part of a certificate.
Epitalon is a synthetic tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, commonly abbreviated AEDG. Its design traces to epithalamin, a peptide fraction prepared from bovine pineal gland extracts that researchers in Saint Petersburg began investigating in the 1970s. The compound has a molecular formula of C14H22N4O9 and a nominal molecular mass near 390 daltons. It holds no approved drug status in the United States or the European Union, and material sold under this name is generally offered as a research chemical rather than a finished pharmaceutical product.
Proposed mechanisms centre on cell-culture observations rather than a defined receptor interaction. Several reports describe increased expression of the telomerase catalytic subunit after exposure of cultured human cells, and the authors attributed the effect to short peptide fragments entering the nucleus and influencing gene transcription. No receptor for the tetrapeptide has been identified, and the free peptide is expected to be degraded rapidly by plasma peptidases. Whether any measurable fraction reaches intact tissues after administration remains an unresolved question rather than an established finding.
The published literature is dominated by a small number of research groups, much of it in Russian-language journals, and independent replication outside those groups is limited. Studies are typically small, use cultured cells or rodent models, and report endpoints that differ between papers, which makes comparison difficult. Large randomised human trials have not appeared in the indexed literature. Questions about absorption, distribution and clearance are therefore still treated as open in reviews that mention the compound.
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.
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.
== Issues == On April 14, 2026, looksmaxxing influencer Clavicular overdosed on a Kick livestream with Androgenic, after he took a combination of the pentastack. The livestream ended, and he was rushed to the hospital. After Androgenic's pentastack video resurfaced, he defended his consumption, claiming it was less harmful than mixing alcohol with cocaine, and describing it as his: "high IQ healthy sustainable drug stack"
A systematic review and meta-analysis has shown that cabergoline and quinagolide are more effective in the treatment of hyperprolactinemia compared to bromocriptine, this is because evidence had suggested fewer side effects, rapid titration and offers better dosing interval in medication like quinagolide compared to bromocriptine. Similar studies have been conducted regarding the safety and efficacy of dopamine agonists. According to SUCRA (Surface Under the Cumulative Ranking) and SMAA (Stochastic Multicriteria Acceptability Analysis), quinagolide was found to be the best treatment for women since it can help reduce menstrual irregularities, in addition bromocriptine was shown to be more effective in the treatment for galactorrhea (breast milk production unrelated to pregnancy), and cabergoline was the safest medication as it did not show any alarming side effects. Other dopamine agonists that have been used less commonly to suppress prolactin include dihydroergocryptine, ergoloid, lisuride, metergoline, pergolide, and terguride. If the prolactinoma does not initially respond to dopamine agonist therapy, such that prolactin levels are still high or the tumor is not shrinking as expected, the dose of the dopamine agonist can be increased in a stepwise fashion to the maximum tolerated dose. Another option is to consider switching between dopamine agonists. The prolactinoma can be resistant to bromocriptine but respond well to cabergoline or other dopamine agonists, and vice versa.
Field-flow fractionation, abbreviated FFF, is a separation technique invented by J. Calvin Giddings. The technique is based on separation of colloidal or high molecular weight substances in liquid solutions, flowing through the separation platform, which does not have a stationary phase. It is similar to liquid chromatography, as it works on dilute solutions or suspensions of the solute, carried by a flowing eluent. Separation is achieved by applying a field (hydraulic, centrifugal, thermal, electric, magnetic, gravitational, ...) or cross-flow, perpendicular to the direction of transport of the sample, which is pumped through a long and narrow laminar channel. The field exerts a force on the sample components, concentrating them towards one of the channel walls, which is called accumulation wall. The force interacts with a property of the sample, thereby the separation occurs, in other words, the components show differing "mobilities" under the force exerted by the crossing field. As an example, for the hydraulic, or cross-flow FFF method, the property driving separation is the translational diffusion coefficient or the hydrodynamic size. For a thermal field (heating one wall and cooling the other), it is the ratio of the thermal and the translational diffusion coefficient.
suborder Clypeasterina family Clypeasteridae L. Agassiz, 1835 family Fossulasteridae Philip & Foster, 1971 † family Scutellinoididae Irwin, 1995 † family Conoclypeidae von Zittel, 1879 † family Faujasiidae Lambert, 1905 † family Oligopygidae Duncan, 1889 † family Plesiolampadidae Lambert, 1905 † suborder Scutellina infraorder Laganiformes family Echinocyamidae Lambert & Thiéry, 1914 family Fibulariidae Gray, 1855 family Laganidae Desor, 1858 infraorder Scutelliformes family Echinarachniidae Lambert in Lambert & Thiéry, 1914 family Eoscutellidae Durham, 1955 † family Protoscutellidae Durham, 1955 † family Rotulidae Gray, 1855 superfamily Scutelloidea Gray, 1825 family Abertellidae Durham, 1955 † family Astriclypeidae Stefanini, 1912 family Dendrasteridae Lambert, 1900 -- Pacific eccentric sand dollar. family Mellitidae Stefanini, 1912 -- Keyhole sand dollars family Monophorasteridae Lahille, 1896 † family Scutasteridae Durham, 1955 † family Scutellidae Gray, 1825 family Taiwanasteridae Wang, 1984 family Scutellinidae Pomel, 1888a † However, the traditional Clypeasteroida is currently not thought to represent a monophyletic group because the Clypeasterina and Scutellina are most likely not each other's closest relatives. Their similarities are possibly the result of convergent evolution. They are part of clade Luminacea, which also includes the orders Cassiduloida and Echinolampadoida. In a recent classification, Clypeasteroida includes only the former Clypeasterina.
Sources: en.wikipedia.org
Mandelbaum (1956), professor at the University of Pennsylvania School of Design Kenneth Silverman (1956), professor at New York University and Pulitzer Prize-winning biographer Robert Alter (1957), professor of Hebrew and comparative literature at the University of California, Berkeley; president of the Association of Literary Scholars, Critics, and Writers Stanley Corngold (1957), professor of literature at Princeton University George Dargo (1957), legal scholar, professor at New England Law Boston Erich S. Gruen (1957), classicist and ancient historian; president of the Society for Classical Studies in 1992 Stanley Insler (1957), philologist and professor at Yale University Jonathan Lubin (1957), professor of mathematics at Brown University; introduced Lubin–Tate formal group law Robert Chazan (1958), professor of Judaic studies at New York University Gerald Feldman (1958), historian who specializes in 20th-century German history; professor at University of California, Berkeley Robert M. Fogelson (1958), urban historian at Massachusetts Institute of Technology Robert W.
There are some skeptics who think that the scratch created for the assay isn't a very accurate representation of an actual wound. This is very likely true as real wounds are inherently more complex, but this assay does allow for collective cell movements under defined experimental conditions to provide some insight. Despite it being described as straightforward, the technique has been criticized because of inconsistencies in its application from one experiment to another.
== History == It came into existence on 1 February 1985 when the Progeny Testing Bull Farm Hisar, which was earlier part of the Government Livestock Farm, Hisar, was transferred from the Government of Haryana state to the Indian Council of Agricultural Research for research on buffaloes (CIRB). On 11 December 1987, a sub-campus near the Bir Dosanjh Wildlife Sanctuary at Nabha in Patiala District was opened, to undertake research on the Nili-Ravi breed of buffalo found in Punjab. In 2016, it became world's second center to produce a cloned buffalo. The first ever successful cloning of buffalo was done by the National Dairy Research Institute, Karnal in 2010
Sources: en.wikipedia.org
Pellagra is a disease caused by a lack of the vitamin niacin (vitamin B3). Symptoms include inflamed skin, diarrhea, dementia, and sores in the mouth. Areas of the skin exposed to friction and radiation are typically affected first. Over time, affected skin may become darker, stiffen, peel, or bleed. The two main types of pellagra are primary and secondary. Primary pellagra is due to a diet that does not contain enough niacin and tryptophan. Secondary pellagra is due to a poor ability to use the niacin within the diet. This can occur as a result of alcoholism, long-term diarrhea, carcinoid syndrome, Hartnup disease, and a number of medications such as isoniazid. Diagnosis is typically based on symptoms and may be assisted by urine testing. Treatment is with either nicotinic acid or nicotinamide supplementation. Improvements typically begin within a few days. General improvements in diet are also frequently recommended. Decreasing sun exposure via sunscreen and proper clothing is important while the skin heals. Without treatment, death may occur. The disease occurs most commonly in the developing world, often as a disease of poverty associated with malnutrition, specifically sub-Saharan Africa.
== External links == Peripheral membrane proteins in OPM database DOLOP Genomics-oriented database of bacterial lipoproteins Peptaibol database Archived 2011-01-27 at the Wayback Machine Antimicrobial Peptide Database Archived 2011-07-20 at the Wayback Machine
In this process, an electron from the analyte molecule (M) is expelled during the collision process to convert the molecule to a positive ion with an odd number of electrons. The following gas phase reaction describes the electron ionization process
Sources: en.wikipedia.org
The powder is normally kept at −20 °C or below in a sealed, moisture-protected container. Letting the vial reach room temperature before opening helps prevent condensation on the contents.
Reversed-phase HPLC with ultraviolet detection is the usual approach, often paired with mass spectrometry. Together the two methods address both chromatographic purity and molecular identity.
Differences arise from the analytical method, the detection wavelength, and whether the number refers to the peptide or to total powder mass. Counterion and water content can lower the actual peptide fraction considerably.
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.