This is a working overview of Lyophilized powder, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-06-08 and is reviewed periodically as new material appears.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not an approved drug | Marketed in most countries as a research chemical |
| Main literature language | Russian and English | Early reports concentrated in Russian journals |
| Typical stated purity | ≥95% by HPLC | Supplier declaration, seldom independently verified |
| Principal studied endpoint | Telomerase activity in vitro | Measured in cultured human cells |
| Reported administration routes | Subcutaneous, intranasal | Described in exploratory use reports |
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.
Epitalon is a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, abbreviated AEDG. Its molecular formula is C14H22N4O9 and its calculated monoisotopic mass is approximately 390.35 daltons. The compound does not occur naturally as a free peptide; it is produced by solid-phase peptide synthesis. Because it contains two acidic residues and no basic residues, the neutral form carries a net negative charge at physiological pH. This charge profile influences how the peptide behaves in solution and during chromatographic analysis.
Laboratory-grade epitalon is typically supplied as a lyophilized powder. Purity is commonly assessed with reverse-phase high-performance liquid chromatography, often paired with mass spectrometry to confirm molecular identity. Amino acid analysis and peptide mapping can provide additional confirmation of sequence. Certificates of analysis for research materials frequently report purity above 95 percent, although the methods behind such figures vary between suppliers. The absence of a pharmacopeial monograph means that no single standardized assay defines the compound, so reported results depend on the analytical protocol chosen.
Storage recommendations center on limiting moisture, heat, and light. The dry powder is generally kept at minus 20 degrees Celsius, and some suppliers recommend minus 80 degrees for long-term archival. Once dissolved, solutions are usually aliquoted and frozen to avoid repeated freeze-thaw cycles, which can promote aggregation or degradation. Aqueous stability depends on pH and concentration, and buffered saline is often preferred over plain water for biological work. Stability data specific to epitalon remain limited, so general peptide-handling practices are applied by analogy rather than from product-specific validation.
Stability of the tetrapeptide follows ordinary peptide chemistry rather than any unusual structural feature. The aspartate-glycine pair is prone to aspartimide formation under mildly basic or neutral conditions, and deamidation can follow, altering both mass and chromatographic retention. Dry lyophilised powder kept at or below minus twenty degrees Celsius is the usual handling recommendation, with repeated freeze-thaw cycles avoided. Once dissolved in neutral aqueous buffer, degradation proceeds over days to weeks depending on pH and temperature, while acidic conditions generally slow the aspartimide route. A formal stability-indicating study has not been published in the indexed literature.
Because epitalon has no pharmacopoeial monograph, quality assessment depends on supplier documentation and independent testing. Certificates of analysis typically report a purity figure from a single chromatographic run, a measured mass and sometimes an appearance description, but methods and acceptance criteria are not harmonised across vendors. Third-party laboratories can repeat identity and purity measurements, and mismatches between labelled and measured peptide content have been described for research peptides generally. What constitutes adequate identity confirmation for a molecule of this size stays an open question, since mass agreement alone does not separate closely related sequences.
Identity testing for epitalon relies on reversed-phase high-performance liquid chromatography for purity and mass spectrometry for mass confirmation. Because the sequence contains no tryptophan or tyrosine, ultraviolet detection at 280 nanometres is insensitive, so chromatographic methods usually monitor absorbance near 214 nanometres, where the peptide backbone absorbs. Electrospray ionisation or matrix-assisted laser desorption/ionisation then checks the intact mass against the expected value near 390 daltons. Peptide mapping or amino acid analysis after acid hydrolysis can supplement these measurements, although such confirmatory work is seldom reported on commercial certificates of analysis.
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 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.
== Origin == The concept of promession was developed by Swedish biologist Susanne Wiigh-Mäsak, deriving its name from the Italian word for "promise", promessa. She founded Promessa Organic AB in 1997 to commercially pursue her idea; however, the company suffered bankruptcy in 2015.
The Boer government later handed the men over to the British for trial and the British prisoners were returned to London. A few days after the raid, the Kaiser of Germany sent a telegram (the "Kruger telegram") congratulating President Kruger and the Transvaal government on their success "without the help of friendly powers", alluding to potential support by Germany. When this was disclosed in the British press, it raised a storm of anti-German feeling. Dr. Jameson was lionised by the press and London society, inflamed by anti-Boer and anti-German feeling and in a frenzy of jingoism. Jameson was sentenced to 15 months for leading the raid, which he served in Holloway Prison, while his second-in-command Willoughby was sentenced to 10 months.. The Transvaal government was paid almost £1 million in compensation by the British South Africa Company. For conspiring with Jameson, the members of the Reform Committee (Transvaal), including Colonel Frank Rhodes and John Hays Hammond, were jailed in deplorable conditions, found guilty of high treason, and sentenced to death by hanging. This sentence was later commuted to 15 years' imprisonment, and in June 1896, all surviving members of the committee were released on payment of stiff fines. As further punishment for his support of Jameson, the highly decorated Col. Rhodes was placed on the retired list by the British Army and barred from active involvement in army business.
poly(A) tail A post-transcriptional modification consisting of a chain of repeated adenosine residues, 40–250 nucleotides in length, attached to the 3' end of nearly all mature eukaryotic messenger RNA transcripts (those of histones being a notable exception).
Sources: en.wikipedia.org
Conway dissuades members of the fandom, and Anthrocon membership in particular, from responding to the mass media and news media, due in part to sensationalist coverage like the 2001 Vanity Fair article in which he was quoted. In 2003 he said his standard response to the media was: "Anthrocon is a private event held on private property. Its membership is not interested in being the subject of your documentary." However, Conway relaxed this stance with Anthrocon's move to Pittsburgh in 2006. While no television, magazine or tabloid representatives were present, several newspapers were invited to attend, and did, including the Pittsburgh Tribune-Review, the Pittsburgh Post-Gazette, and the Pittsburgh City Paper, which printed both a preview and an extensive review. When local television station KDKA-TV showed up, Conway gave a short television interview outside the convention hotel. In November 2006 he gave a radio interview to Dublin's 98FM. Anthrocon still retains tight control over media access, not only to the convention grounds but to the membership, and has official policy that forbids unmonitored dealings with unauthorized members of the media.
Some infections, for example, those from the common cold and influenza, do not confer any long-lasting immunity. Such infections may give temporary resistance but do not give long-term immunity upon recovery from infection, and individuals become susceptible again.
18 June: The New Zealand Government announces the scrapping of the five-yearly national census. The Māori iwi (tribe) Te Patutokotoko files legal action against Conservation Minister Tama Potaka and the Department of Conservation for not consulting them about granting ten-year concessions to Whakapapa Holdings Limited and Pure Tūroa to run the Tūroa and Whakapapa skifields. New World's Victoria Park supermarket in Auckland is extensively damaged during a major fire. 19 June – The New Zealand Government confirms it suspended NZ$20 million of core sector support funding to the Cook Islands in early June 2025 in retaliation for the Cook Islands government signing a partnership agreement with China without consulting New Zealand, per the requirements of their free association relationship. 20 June Prime Minister Christopher Luxon meets with Chinese President Xi Jinping in Beijing to discuss strengthening bilateral tourism, education and agricultural trade. The New Zealand Symphony Orchestra announces simultaneously the scheduled conclusion of the tenure of Gemma New as its artistic director and principal conductor in 2027, and the appointment of André de Ridder as its new music director, effective in 2027. 21 June – Brian Tamaki's Destiny Church stages a march in Auckland's Aotea Square opposing the spread of non-Christian religions and immigration in New Zealand. Destiny Church's actions are denounced by Minister for Ethnic Communities Mark Mitchell.
In response, Cottrell went on to establish an independent nonprofit organization on 26 February 1912 — the Research Corporation for Science Advancement — not only to manage his own patents, but to "contract with various universities, industry workers, and unattached inventors in order to manage their patents", with the profits used to fund research, regardless of the applicant's university. In 1925, Harry Steenbock, a professor of biochemistry at the University of Wisconsin–Madison, offered to assign his thyroxine patent rights (HS.1) to the university. The university's Regents declined Steenbock's offer. In response, the Wisconsin Alumni Research Foundation (WARF), an independent University technology transfer office, was created to manage Steenbok's patent; and, by 2023, WARF had gone on to manage more than 4,200 patents (with 2,200 patents still active). For Robertson, the need for appropriate buildings, laboratories, supplies, and equipment to be funded for research was always at least as important as the funding of any individual researcher. In 1917, in a precedent-setting action, Robertson proposed assigning his patent rights to the University of California (EN.1; SC.1) (i.e., rather than Cottrell's non-specific Research Corporation) specifically to support medical research at the University of California.
Sources: en.wikipedia.org
== Adverse effects == Adverse effects include reactions at the injection site, such as a hot or painful feeling as well as general reactions such as nausea and vomiting. All of these are usually mild and transient. Allergy-like effects such as itching, sneezing, coughing and yawning can be the first sign of severe adverse reactions, especially a shock. Accidental intrathecal administration (into the spinal canal) can result in life-threatening reactions such as convulsions, cerebral (brain) edema or cerebral bleed.
== Synthesis == In the synthesis of melanotan II, an ε-amino group of lysine and an γ-carboxy group of aspartic acid have their orthogonal protection removed before undergoing a carbodiimide mediated lactamization, leading to an intermediate. This intermediate, when attached to N-acetylnorleucine, forms melanotan II. The entire process can be accomplished in 12 steps with an overall yield of 2.6%, and the product is more than 90% pure without preparative chromatography.
It was later revealed that Fripp had attempted to replace himself with McDonald and Steve Hackett of Genesis, but this was rejected by the managers. Following the band's disbandment, the live album USA was released in May 1975, formed of recordings from their 1974 North American tour. It received some positive reviews, including being deemed "a must" for fans of the band and "insanity you're better off having". Issues with the tapes rendered some of Cross's playing inaudible, so Eddie Jobson of Roxy Music was hired to perform violin and keyboard overdubs; further edits were also made to allow the music to fit on a single LP. More live recordings from the 1972–1974 era would be issued as The Night Watch in 1997, and as part of the box sets The Great Deceiver (1992), Larks' Tongues in Aspic (1972–1973) (2012), The Road to Red (1974), and Starless (1973–1974) (both 2014). After short stints with Roxy Music and Uriah Heep, Wetton went on to co-form U.K. with Bruford in 1977, and Asia in 1981; Bruford, in addition to U.K., formed the jazz fusion band Bruford. From 1975 to 1980, King Crimson were completely inactive.
Sources: en.wikipedia.org
Small studies with human participants have been reported, chiefly in Russian-language journals, but they are limited in size and design. No large randomised controlled trial with published results is available.
The most reproducible biochemical observation comes from cultured cells, where the peptide was reported to raise telomerase activity. Whether this translates into measurable health effects in animals or humans is not established.
It is offered as a research chemical for laboratory use, which places it outside the approval pathways applied to medicines. Buyers should expect documentation to differ between suppliers.
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.