Everything below concerns AEDG. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-04-27. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Calculated from the four residues with three water losses |
| Molecular mass | About 390.35 g/mol | Monoisotopic mass near 390.14, used for mass-spectrometric identification |
| Peptide sequence | Ala-Glu-Asp-Gly | Single-letter form AEDG; no disulfide bonds or modified residues |
| Appearance | White to off-white solid | Supplied as a dried powder |
| Isoelectric point | Around 4 | Estimated from aspartate and glutamate side-chain pKa values |
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.
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.
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.
Human data are limited to small studies, often without the randomization, blinding, or control groups expected in contemporary clinical research. Reported outcomes have included changes in melatonin levels, immune markers, and subjective measures, but sample sizes were generally too small to support firm conclusions. Some reviews treat the peptide as promising while noting methodological weaknesses; others question whether the observed effects are specific. The compound is frequently discussed in longevity-focused communities, where enthusiasm often outpaces the published evidence. Separating established findings from speculation is therefore important when reading summaries of this research.
== History == Dantrolene was first described in the scientific literature in 1967, as one of several hydantoin derivatives proposed as a new class of muscle relaxant. Dantrolene underwent extensive further development, and its action on skeletal muscle was described in detail in 1973. Dantrolene was widely used in the management of spasticity before its efficacy in treating malignant hyperthermia was discovered by South African anesthesiologist Gaisford Harrison and reported in a landmark 1975 article published in the British Journal of Anaesthesia. Harrison experimentally induced malignant hyperthermia with halothane anesthesia in genetically susceptible pigs, and obtained an 87.5% survival rate, where seven of his eight experiments survived after intravenous administration of dantrolene. The efficacy of dantrolene in humans was later confirmed in a large, multicenter study published in 1982, and confirmed epidemiologically in 1993. Before dantrolene, the only available treatment for malignant hyperthermia was either procainamide or procaine, the latter being associated with a 60% mortality rate in animal models.
These illicit pills often contain "a mix of amphetamines, caffeine and various fillers", which are sometimes referred to as "captagon" (with a lowercase "c"). According to some leaks, militant groups export the drug in exchange for weapons and cash. According to Abdelelah Mohammed Al-Sharif, secretary general of the National Committee for Narcotics Control and assistant director of Anti-Drug and Preventative Affairs, forty percent of users between the ages of twelve and twenty-two in Saudi Arabia are addicted to fenethylline. In 2017, fenethylline was the most popular recreational drug in the Arabian Peninsula. In October 2015, a member of the Saudi royal family, Prince Abdel Mohsen Bin Walid Bin Abdulaziz, and four others were detained in Beirut on charges of drug trafficking after airport security discovered two tons of fenethylline pills and some cocaine on a private jet scheduled to depart for Riyadh, the capital of Saudi Arabia. The following month, Agence France-Presse reported that Turkish authorities had seized two tonnes of fenethylline—about eleven million pills—during raids in the Hatay region on the Syrian border. The pills had been produced in Syria and were being shipped to countries in the Arab states of the Persian Gulf. In December 2015, the Lebanese Army announced that it had discovered two large-scale drug production workshops in the north of the country and seized large quantities of fenethylline pills. Two days earlier, three tons of fenethylline and hashish were seized at Beirut Airport, concealed in school desks being exported to Egypt.
Human feces has historically been used as fertilizer for centuries in the form of night soil, fecal sludge, and sewage sludge. The use of untreated human feces in agriculture poses significant health risks and has contributed to widespread infection with parasitic worms—a disease called helminthiasis, affecting over 1.5 billion people in developing countries.
Aerosol mass spectrometry has also found its way into the field of pharmaceutical aerosol analysis, due to its ability to provide real-time measurements of particle size and chemical composition. People who suffer from chronic respiratory disease commonly receive their medication through the use of either pressurized metered dose inhaler (pMDI) or dry powder inhaler (DPI). In both methods the drug is delivered directly into the lungs by inhalation. In recent years, inhaled products have become available which deliver two types of drug within a single dose. Research has shown that the two drugs inhalers provide an enhanced clinical effect beyond that achieved when the two drugs are administered concurrently from two separate inhalers. It was determined using an AToFMS that the respirable particles in a DPI product and pMDI product were composed of co-associated active pharmaceutical ingredients, which is the reason behind the increased effects of the two drug inhalers.
Sources: en.wikipedia.org
=== Tumis tempe or oseng tempe === Stir-fried tempeh with vegetables such as green bean, basil, or onion, with spices. Other recipes might add coconut milk for a milky-colored, and rather moist, stir-fried tempeh.
Until about the time of the Meiji Restoration in 1868, cattle were used only as draught animals, in agriculture, forestry, mining and transport, and as a source of fertilizer. Milk consumption was unknown, and – for cultural and religious reasons – meat was not eaten. Cattle were highly prized and valuable, too expensive for a poor farmer to buy. Japan was effectively isolated from the rest of the world from 1635 until 1854; there was no possibility of the intromission of foreign genes to the cattle population during this time. In western Japan during the Edo period (1603–1867), superior cattle were produced by aggressive inbreeding, and the superior bloodlines were called "tsuru" (蔓, lit. 'vine'), and cattle with superior bloodlines (tsuru-ushi, lit. 'vine cattle') were traded at high prices. Famous tsuru include the Takenotani tsuru (Okayama Prefecture), Bokura tsuru (Shimane Prefecture), Iwakura tsuru (Hiroshima Prefecture), and Shusuke tsuru (Hyōgo Prefecture). In Japan, where meat eating was frowned upon and the use of milk was not widespread, cows in the Edo period were primarily work cattle that plowed the fields, so a good cow in this period meant one that was healthy and obedient.
==== Myasthenia gravis ==== Myasthenia gravis is an autoimmune disease most often caused by antibodies that block acetylcholine receptors, which are responsible for signaling between nerves and muscles. It is often associated with thymic hyperplasia or thymoma, with antibodies produced probably because of abnormally developed T cells. Myasthenia gravis most often develops between young and middle age, causing easy fatiguing of muscle movements. Investigations include demonstrating antibodies (such as against acetylcholine receptors or muscle-specific kinase), and CT scan to detect thymoma or thymectomy. Concerning the thymus, removal of the thymus, called thymectomy, may be considered as a treatment, particularly if a thymoma is found. Other treatments include increasing the duration of acetylcholine action at nerve synapses by decreasing the rate of breakdown. This is done by acetylcholinesterase inhibitors such as pyridostigmine.
The withdrawal syndrome from heroin may begin within as little as two hours of discontinuation of the drug; however, this time frame can fluctuate with the degree of tolerance as well as the amount of the last consumed dose, and more typically begins within 6–24 hours after cessation. Symptoms may include sweating, malaise, anxiety, depression, akathisia, priapism, extra sensitivity of the genitals in females, general feeling of heaviness, excessive yawning or sneezing, rhinorrhea, insomnia, cold sweats, chills, severe muscle and bone aches, nausea, vomiting, diarrhea, cramps, watery eyes, fever, cramp-like pains, and involuntary spasms in the limbs (thought to be an origin of the term "kicking the habit").
=== Research profile and funding === Arizona is classified among "R1: Doctoral Universities – Very high research activity". The University of Arizona achieved $1.012 billion in research expenditures for fiscal year 2024, ranking 19th among public universities nationwide. The University of Arizona is the fourth most awarded public university by NASA for research. UA students have been selected as Truman, Rhodes, Goldwater, and Fulbright Scholars. According to The Chronicle of Higher Education, UA is among the top 25 producers of Fulbright awards in the U.S. UA is a member of the Association of Universities for Research in Astronomy, a consortium of institutions pursuing research in astronomy. The association operates observatories and telescopes, notably Kitt Peak National Observatory just outside Tucson. UA is a member of the Association of American Universities.
Sources: en.wikipedia.org
=== Pregnancy and breastfeeding === Risk for the fetus has not been ruled out, per being rated pregnancy category C in Australia, meaning that it may be suspected of causing harmful effects on the human fetus (but no malformations). It appears to be safe in breastfeeding.
=== October === 8 October – Tánaiste Micheál Martin said that the Department of Foreign Affairs had been in touch with the family of Kim Damti (22), an Irish-Israeli woman who was unaccounted for following the previous day's series of attacks launched by Hamas on Israel. On 11 October, Damti was confirmed dead. 10 October – Minister for Finance Michael McGrath and Minister for Public Expenditure, National Development Plan Delivery and Reform Paschal Donohoe announced Budget 2024, with three electricity credits for all households, a €12 increase to core social welfare payments and half-price travel for those aged under 25. 23 October – Yousef Palani was sentenced to two life sentences plus 20 years for the murder of two men and the stabbing of a third in Sligo, all of who he had sought out on a pretence of dating. 25 October – The Health Products Regulatory Authority (HPRA) said it had seized 254 units of falsified Semaglutide, a drug used for type 2 diabetes and as an unofficial aide to weight loss, during 2023. 27 October – Latest figures showed that homelessness in Ireland hit new records: 8,923 adults and 3,904 children accessed emergency accommodation in September 2023, bringing the total to 12,827 people.
=== Two-dimensional nanostructures === 2D materials are crystalline materials consisting of a two-dimensional single layer of atoms. The most important representative graphene was discovered in 2004. Thin films with nanoscale thicknesses (nanofilms) are considered nanostructures, but are sometimes not considered nanomaterials because they do not exist separately from the substrate.
==== Protein C and Protein S ==== Protein C is a major physiological anticoagulant. It is a vitamin K-dependent serine protease enzyme that is activated by thrombin into activated protein C (APC). Protein C is activated in a sequence that starts with Protein C and thrombin binding to a cell surface protein thrombomodulin. Thrombomodulin binds these proteins in such a way that it activates Protein C. The activated form, along with protein S and a phospholipid as cofactors, degrades FVa and FVIIIa. Quantitative or qualitative deficiency of either (protein C or protein S) may lead to thrombophilia (a tendency to develop thrombosis). Impaired action of Protein C (activated Protein C resistance), for example by having the "Leiden" variant of Factor V or high levels of FVIII, also may lead to a thrombotic tendency.
Sources: en.wikipedia.org
No. Epithalamin is a peptide-containing extract of bovine pineal glands, while epitalon is a single synthetic tetrapeptide. The extract contains many peptides and other tissue components, so its composition varies between batches in ways that a synthesised sequence does not.
It is not recognised as an endogenous peptide hormone. The four-residue sequence can appear inside larger proteins and in digestive fragments of dietary protein, but no dedicated pathway producing it as a signalling molecule has been identified.
Several cell-culture reports describe increased telomerase activity after treatment, measured by enzyme assays or by transcript levels. Results differ between cell types and laboratories, and measured telomere lengthening has been reported in some studies but not in others, which leaves the physiological relevance open.
The solid is kept cold, dry and dark, typically at minus twenty degrees Celsius, in a sealed container with desiccant. Dissolved material is kept refrigerated and used promptly. Freezing and thawing a solution repeatedly is avoided because it accelerates degradation.