The short version of epithalamin fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-03-16 and is reviewed periodically as new material appears.
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.
Literature searches for this compound must account for several spelling variants. Indexing databases contain epitalon, epithalon, epithalone, and AEDG, and relevant records are scattered across Russian-language and English-language journals that do not consistently cross-cite. Early publications describe the parent extract as a mixture of many peptides, whereas later work addresses the single synthetic tetrapeptide. That shift in nomenclature complicates comparison between studies, because extract data and tetrapeptide data are sometimes cited interchangeably. A search strategy omitting the alternate spellings will return an incomplete set of references.
Reported biological findings come mainly from cell culture and rodent experiments. Those studies describe changes in telomerase catalytic subunit expression, melatonin rhythm amplitude, and antioxidant enzyme activity after peptide exposure. Human data are sparse and consist of small trials with limited blinding and inconsistent endpoints. The proposed mechanisms remain hypotheses rather than established facts, and there is no consensus on whether effects observed in animals carry over to people. Independent replication outside the original research groups is limited, which is a recognised gap in the published literature.
The parent extract epithalamin was characterised as a low-molecular-weight fraction of pineal tissue rather than a single defined chemical entity. Researchers fractionated it and tested successive fragments for activity, a screening approach typical of peptide discovery work in that era. Epitalon emerged from that process as one of the shorter sequences of interest. Because the original extract was never fully resolved into individual components, claims about which constituent drives a given effect rest on inference. This distinction matters when reading older reports that attribute extract observations to the tetrapeptide itself.
| 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 |
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. 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.
There is no specific antidote for overdose and all treatment is purely supportive and symptomatic. Treatment with activated charcoal may be used to limit absorption in cases of oral overdose. Anyone suspected of overdosing on clomipramine should be hospitalised and kept under close surveillance for at least 72 hours. Clomipramine has been reported as being less toxic in overdose than most other TCAs in one meta-analysis but this may well be due to the circumstances surrounding most overdoses as clomipramine is more frequently used to treat conditions for which the rate of suicide is not particularly high such as OCD. In another meta-analysis, however, clomipramine was associated with a significant degree of toxicity in overdose.
=== Intravenous injection === Testosterone esters like testosterone enanthate are hydrolyzed into testosterone so rapidly in the blood that testosterone and testosterone enanthate have nearly identical pharmacokinetics when administered via intravenous injection.
== Corporate Social Responsibility == As part of their Corporate Social Responsibility commitment, Hetero Group founded Sindhu Hospitals, a not-for-profit yet premium healthcare facility dedicated to providing world class healthcare underserved communities.
Site-selectivity, also positional or regioselectivity, is generally desired but no requirement for LSF reactions because site-unselective LSF reactions can also be useful for special purposes. For example, site-unselective late-stage C–H functionalization reactions can provide quick access to several constitutional isomers of complex molecules relevant for biological testing in drug discovery. Site-selective reactions to access each possible constitutional isomer independently are scarce but highly desirable because cumbersome purification procedures are avoided, and other isomers are not produced as waste. Some LSF reactions provide one constitutional isomer in high selectivity based on innate substrate selectivity for a given reaction or based on catalyst control. The discovery of site-selective LSF reactions constitutes an important research objective in the field of synthetic methodology development.
Sources: en.wikipedia.org
The Chinese associated the five elements with the five planets (Jupiter, Mars, Venus, Saturn, and Mercury) similar to the way the classical planets were associated with different metals. The yin and yang distinction approximates the modern notion of solid and hollow organs.
=== Proteins and nucleic acids === Daly developed methods for separating out the nuclei of tissues and measuring the base composition of purines and pyrimidines in desoxypentose nucleic acids. She concluded, among other things, that "no bases other than adenine, guanine, thymine, and cytosine were present in appreciable amounts." She investigated protein synthesis, including the role of cytoplasmic ribonucleoprotein in protein synthesis. Using radiolabeled amino acid glycine, she was able to measure how protein metabolism changed under feeding and fasting conditions in mice. This allowed her to monitor the activity of the cytoplasm as the radiolabeled glycine was taken up into the cell nucleus. In 1953, Watson and Crick described the structure of DNA. Accepting the Nobel Prize for this work in 1962, Watson cited one of Daly's papers on "The role of ribonucleoprotein in protein synthesis" as contributing to his work. After 1953, the cell nucleus research field was flooded with funding opportunities.
American Zionism was still in its infancy; in 1914 the Zionist Federation had a small budget of about $5,000 and only 12,000 members, despite an American Jewish population of three million but the Zionist organizations had recently succeeded, following a show of force within the American Jewish community, in arranging a Jewish congress to debate the Jewish problem as a whole. This impacted British and French government estimates of the balance of power within the American Jewish public. Avi Shlaim, emeritus Professor of International Relations in the University of Oxford, asserts that two main schools of thought have been developed on the question of the primary driving force behind the declaration, one presented in 1961 by Leonard Stein, a lawyer and former political secretary to the World Zionist Organization, and the other in 1970 by Mayir Vereté, then Professor of Israeli History at the Hebrew University of Jerusalem. Shlaim states that Stein does not reach any clear cut conclusions, but that implicit in his narrative is that the declaration resulted primarily from the activity and skill of the Zionists, whereas according to Vereté, it was the work of hard-headed pragmatists motivated by British imperial interests in the Middle East. Much of modern scholarship on the decision to issue the declaration focuses on the Zionist movement and rivalries within it, with a key debate being whether the role of Weizmann was decisive or whether the British were likely to have issued a similar declaration in any event.
Sources: en.wikipedia.org
==== MeSH D12.776.467.374.440 – interferons ==== MeSH D12.776.467.374.440.890 – interferon type i MeSH D12.776.467.374.440.890.125 – interferon type i, recombinant MeSH D12.776.467.374.440.890.125.100 – interferon alfa-2a MeSH D12.776.467.374.440.890.125.150 – interferon alfa-2b MeSH D12.776.467.374.440.890.125.200 – interferon alfa-2c MeSH D12.776.467.374.440.890.250 – interferon-alpha MeSH D12.776.467.374.440.890.250.100 – interferon alfa-2a MeSH D12.776.467.374.440.890.250.150 – interferon alfa-2b MeSH D12.776.467.374.440.890.250.200 – interferon alfa-2c MeSH D12.776.467.374.440.890.275 – interferon-beta MeSH D12.776.467.374.440.893 – interferon type ii MeSH D12.776.467.374.440.893.510 – interferon-gamma, recombinant
Other studies found that, in Tanzania, skin bleaching has been regularly practiced by middle and working classes, as light skin was perceived to facilitate social mobility. Skin whitening practices in several other African countries increased following the onset of independence movements against European colonial rule. Maya Allen attributed this to the increased flow of European products and commercial influence into colonized regions. Several historians have suggested that the increased prevalence of skin whitening in "the Global South" is potentially tied to both precolonial notions of beauty and post-colonial hierarchies of race.
Acrocyanosis is persistent blue or cyanotic discoloration of the extremities, most commonly occurring in the hands, although it also occurs in the feet and distal parts of the face. Although described over 100 years ago and not uncommon in practice, the nature of this phenomenon is still uncertain. The very term "acrocyanosis" is often applied inappropriately in cases when blue discoloration of the hands, feet, or parts of the face is noted. The principal (primary) form of acrocyanosis is that of a benign cosmetic condition, sometimes caused by a relatively benign neurohormonal disorder. Regardless of its cause, the benign form typically does not require medical treatment. A medical emergency would ensue if the extremities experience prolonged periods of exposure to the cold, particularly in children and patients with poor general health. However, frostbite differs from acrocyanosis because pain (via thermal nociceptors) often accompanies the former condition, while the latter is very rarely associated with pain. There are also a number of other conditions that affect hands, feet, and parts of the face with associated skin color changes that need to be differentiated from acrocyanosis: Raynaud phenomenon, pernio, acrorygosis, erythromelalgia, and blue finger syndrome. The diagnosis may be challenging in some cases, especially when these syndromes co-exist. Acrocyanosis may be a sign of a more serious medical problem, such as connective tissue diseases and diseases associated with central cyanosis.
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 based on epithalamin, a peptide-rich preparation obtained from pineal gland tissue and studied in the former Soviet Union. Researchers later identified the tetrapeptide AEDG as a constituent fragment of that material. Modern supplies are produced by chemical synthesis rather than tissue extraction.