A practical reference on AEDG tetrapeptide: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-05-09. Anything still debated is marked as such rather than presented as settled.
Epitalon emerged from research conducted in Saint Petersburg by Vladimir Khavinson and colleagues, who studied short peptides as potential regulators of aging. The work built on epithalamin, a pineal gland extract reported to influence neuroendocrine function. Epitalon was designed as a synthetic counterpart with a defined sequence, allowing reproducible experiments that extracts could not support. Early publications described effects on melatonin rhythms and lifespan in animal models. These findings circulated mainly in Russian-language journals during the 1990s, which limited their visibility among English-speaking researchers.
The most widely cited claim is that epitalon activates telomerase and thereby extends telomere length. Supporting evidence comes largely from cultured human cells, where treatment was associated with increased telomerase activity and delayed replicative senescence. Telomerase activation is a biologically consequential effect, since the enzyme is largely silenced in most somatic cells. However, the route by which a short peptide would reach and act on the enzyme's regulatory machinery has not been established. Independent replication in human trials is scarce, so the link between cell-culture observations and whole-body aging remains an open question.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Peptide sequence | Ala-Glu-Asp-Gly | Single-letter form AEDG |
| Compound class | Synthetic tetrapeptide | Not a natural free peptide |
| Research origin | Russian gerontology institutes | Developed during the 1990s |
| Main research claim | Telomerase activation | Evidence mainly from cultured cells |
| Regulatory status | Not an approved drug | Handled as a research material |
Freeze-dried epitalon is normally kept at minus twenty degrees Celsius in a sealed, desiccated container, protected from light. Short excursions at ambient temperature during shipping are generally tolerated, but repeated warming and cooling cycles encourage moisture uptake, which shortens shelf life. Once dissolved, the peptide is far less stable than the solid: aqueous solutions are subject to hydrolysis and to deamidation at the aspartate and glutamate residues. Working solutions are therefore held refrigerated and used within days, and repeated freezing and thawing of the same vial is best avoided.
Identity and purity are checked by reversed-phase high-performance liquid chromatography, usually with ultraviolet detection near 214 nanometres, where the peptide bond absorbs. Mass spectrometry confirms the expected mass and reveals whether truncation products or adducts are present. Acid hydrolysis followed by amino acid analysis gives the residue ratio, which should approximate one alanine, one glutamate, one aspartate and one glycine. Counter-ions such as acetate or trifluoroacetate remain in the dried product and lower net peptide content, so a stated purity figure on a label does not by itself describe how much peptide a vial holds.
Regulatory treatment differs by country. No formulation of epitalon holds a marketing authorisation as a medicine in the United States or the European Union, where material sold for laboratory use is handled as a research chemical and is not intended for human consumption. In Russia, several short peptide preparations from the same institute's peptide series are registered medicinal products, and epitalon appears in that national context. Elsewhere it is frequently offered as a cosmetic ingredient, a category with lighter requirements. Advertising claims about longevity or disease prevention are restricted in most jurisdictions, which limits how sellers describe the compound.
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.
The Lutheran church was the state church of the Kingdom of Hanover, with the King being summus episcopus (Supreme Governor of the Lutheran Church). Regional consistories supervised church and clergy. These were in Aurich, a simultaneously Lutheran and Calvinist consistory dominated by Lutherans (for East Frisia) and the Lutheran consistories in Hanover (for the former Electorate of Brunswick-Lüneburg proper), in Ilfeld (for the County of Hohenstein, a Hanoverian exclave in the Eastern Harz mountains), in Osnabrück (for the former Prince-Bishopric of Osnabrück), in Otterndorf (existed 1535–1885 for the Land of Hadeln) as well as in Stade (existed 1650–1903, until 1885 for the former Bremen-Verden proper without Hadeln, then including the complete Stade region). A general superintendent chaired each consistory. In 1848, the Lutheran parishes were democratised by the introduction of presbyteries (German: Kirchenvorstände, singular Kirchenvorstand; literally: church boards), elected by all major male parishioners and chairing each congregation in co-operation with the pastor, being before the sole chairman. This introduction of presbyteries was somewhat revolutionary in the rather hierarchically structured Lutheran church. In 1864, Carl Lichtenberg, Hanoverian minister of education, cultural and religious affairs (1862–65), persuaded the Ständeversammlung (lit. Estates Assembly, the Hanoverian parliament) to pass a new law as to the constitution of the Lutheran church. The constitution provided a state synod (parishioners' parliament, German: Landessynode).
== Related compounds == N-Methyliminodiacetic acid (MIDA), the N-methyl derivative of IDA Imidodiacetic acid, the amino diacetic acid N-(2-Carboxyethyl)iminodiacetic acid, a more biodegradable analogue of NTA N-hydroxyiminodiacetic acid (HIDA), HON(CH2CO2H)2 (registry number = 87339-38-6) See HIDA scan.
HRBeauty LLC, d.b.a. rhode (stylized in all lowercase), is an American skincare brand founded by model and entrepreneur Hailey Bieber, alongside Michael D. and Lauren Ratner, in 2022. It is based in Beverly Hills, California. Rhode products are distributed through its official website, Sephora, and available in multiple regions, including the United States, Canada, the United Kingdom, and Australia. Originally launched offering three products, Rhode's product line has since grown to include facial cleansers, lotions, lip balms and blushes. It was acquired by e.l.f. Beauty in May 2025 in a US$1 billion deal.
Anatomy, In Our Time. BBC Radio 4. Melvyn Bragg with guests Ruth Richardson, Andrew Cunningham and Harold Ellis. "Anatomy of the Human Body". 20th edition. 1918. Henry Gray Parsons, Frederick Gymer (1911). "Anatomy" . Encyclopædia Britannica. Vol. 1 (11th ed.). pp. 920–943. Anatomia Collection: anatomical plates 1522 to 1867 (digitized books and images) Lyman, Henry Munson. The Book of Health (1898). Science History Institute Digital Collections Archived 2 February 2019 at the Wayback Machine. Gunther von Hagens True Anatomy for New Ways of Teaching.
Sources: en.wikipedia.org
Importantly, this results in a mixture of comic effects and of a serious aspiration to reflect on the continuing relevance of gender roles in the 21st century. The text can thus also be read as a literary plea for overcoming narrowly conceived identity politics and identity-based divisions.
=== Cell culture === Connecting the DMF chip to use in the field or world-to-chip interfaces have been accomplished by means of manual pumps and reservoirs which deliver microbes, cells, and media to the device. The lack of extensive pumps and valves allow for elaborate multi step applications involving cells performed in a simple and compact system. In one application, microbial cultures have been transferred onto the chip and allowed to grow with the use of sterile procedures and temperature required for microbial incubation. To validate that this was a viable space for microbial growth, a transformation assay was carried out in the device. This involves exposing E.coli to a vector and heat shocking the bacteria until they take up the DNA. This is then followed by running a DNA gel to assure that the wanted vector was taken up by the bacteria. This study found that the DNA indeed was taken up by the bacteria and expressed as predicted. Human cells have also been manipulated in Digital Microfluidic Immunocytochemistry in Single Cells (DISC) where DMF platforms were used to culture and use antibodies to label phosphorylated proteins in the cell. Cultured cells are then removed and taken off chip for screening. Another technique synthesizes hydrogels within DMF platforms. This process uses electrodes to deliver reagents to produce the hydrogel, and delivery of cell culture reagents for absorption into the gel. The hydrogels are an improvement over 2D cell culture because 3D cell culture have increased cell-cell interactions and cel-extracellular matrix interactions.
=== Overdose === Overdose is extremely dangerous; cases reported to poison control centers had a 11.9 percent fatality rate between 2010 and 2020. Although the largest number of overdose deaths occurred in the 1910s and 1920s when the chemical was in more widespread industrial use, the substance's use as a dieting aid has caused a number of fatalities in the 21st century: at least 50 overdose deaths were reported worldwide between 2010 and 2020. Although the lowest published fatal ingested dose is 4.3 mg/kg, a typical overdose death occurs at a higher level of exposure, around 20–50 mg/kg. The first symptoms to appear are nausea, vomiting, abdominal pain, and perhaps diarrhea. The typical overdose syndrome seen with DNP and other phenols is a combination of hyperthermia, tachycardia, diaphoresis, and tachypnoea. Because of the heat produced during uncoupling, DNP overdose will overpower the body's attempt to maintain thermal homeostasis and cause an uncontrolled, fatal rise in body temperature up to as high as 44 °C (111 °F). The disruption of metabolism also leads to the accumulation of potassium and phosphate, potentially contributing to toxicity. DNP can cause T wave and ST segment abnormalities; heart muscle, kidney, and liver damage have been found on autopsy. According to an analysis of United Kingdom and United States overdose cases, tachycardia, hyperpyrexia, acidosis, and agitation or confusion are independent predictors of overdose death. There is no antidote to DNP and management strategies are based on expert opinion and case studies.
Sources: en.wikipedia.org
Ethanol has been found to enhance GABAA receptor-mediated currents in functional assays. Ethanol has long shown a similarity in its effects to positive allosteric modulators of the GABAA receptor like benzodiazepines, barbiturates, and various general anesthetics. Some of these effects include anxiolytic, anticonvulsant, sedative, and hypnotic effects, cognitive impairment, and motor incoordination. In accordance, it was theorized and widely believed that the primary mechanism of action of ethanol is GABAA receptor positive allosteric modulation. However, other ion channels are involved in its effects as well. Although ethanol exhibits positive allosteric binding properties to GABAA receptors, its effects are limited to pentamers containing the δ-subunit rather than the γ-subunit. Ethanol potentiates extrasynaptic δ subunit-containing GABAA receptors at behaviorally relevant (as low as 3 mM) concentrations, but γ subunit receptors are enhanced only at far higher concentrations (> 100 mM) that are in excess of recreational concentrations (up to 50 mM). GABAA receptors containing the δ-subunit have been shown to be located exterior to the synapse and are involved with tonic inhibition rather than its γ-subunit counterpart, which is involved in phasic inhibition. The δ-subunit has been shown to be able to form the allosteric binding site which makes GABAA receptors containing the δ-subunit more sensitive to ethanol concentrations, even to moderate social ethanol consumption levels (30mM). While it has been shown by Santhakumar et al.
L-Tyrosine or tyrosine (symbol Tyr or Y) or 4-hydroxyphenylalanine is one of the 20 standard amino acids that are used by cells to synthesize proteins. It is a conditionally essential amino acid with a polar side group. The word "tyrosine" is from the Greek tyrós, meaning 'cheese', as it was first discovered in 1846 by German chemist Justus von Liebig in the protein casein from cheese. It is called tyrosyl when referred to as a functional group or side chain. While tyrosine is generally classified as a hydrophobic amino acid, it is more hydrophilic than phenylalanine. It is encoded by the codons UAC and UAU in messenger RNA. The one-letter symbol Y was assigned to tyrosine for being alphabetically nearest of those letters available. Note that T was assigned to the structurally simpler threonine, U was avoided for its similarity with V for valine, W was assigned to tryptophan, while X was reserved for undetermined or atypical amino acids. The mnemonic tYrosine was also proposed.
== External links == Fighting the Oil Well Fires Archived 2015-02-20 at the Wayback Machine Oil fire photographs taken by a Kuwaiti journalist in 1991 Archived 2017-03-20 at the Wayback Machine "The Kuwaiti Oil Fires (Environmental Disasters)" Facts on File, Inc., April 2005, ISBN 0816057583, Author: Kristine Hirschmann
Dithiothreitol (DTT) is an organosulfur compound with the formula (CH(OH)CH2SH)2. A colorless compound, it is classified as a dithiol and a diol. DTT is redox reagent also known as Cleland's reagent, after W. Wallace Cleland. The reagent is commonly used in its racemic form. Its name derives from the four-carbon sugar, threose. DTT has an epimeric ('sister') compound, dithioerythritol (DTE).
Sources: en.wikipedia.org
Vladimir Khavinson and colleagues at research institutes in Saint Petersburg developed and studied the peptide. Their program examined short peptides as regulators of aging and neuroendocrine function. Epitalon was one of several compounds produced by that group.
That question is not settled. Cell culture studies have reported increased telomerase activity after treatment, but comparable evidence from controlled human trials is lacking. Any claim about telomere lengthening in people should be treated as unproven.
It has not completed the large, controlled trials required for drug approval in major jurisdictions. Most human reports involve small samples and limited follow-up. As a result, it is sold as a research chemical rather than a licensed pharmaceutical product.
It is a synthetic tetrapeptide built from alanine, glutamate, aspartate and glycine. The four residues are joined by standard peptide bonds, giving a linear chain rather than a branched structure.