A practical reference on Epithalamin: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-12-06. Anything still debated is marked as such rather than presented as settled.
Several names circulate for the same molecule, including epitalon, epithalone, epithalamin tetrapeptide, and the sequence code AEDG. A CAS registry number, 307297-39-8, is commonly cited for it, though catalogue entries should be checked against supplier documentation because mislabelled records occur. In its usual form the peptide carries free amino and carboxyl termini and is neither glycosylated nor lipidated. Researchers distinguish the defined tetrapeptide from epithalamin itself, a crude pineal preparation containing many peptides that is not chemically characterised.
Material supplied for laboratory use is normally a lyophilised white to off-white powder that dissolves readily in water and in isotonic saline. Lyophilised cakes are hygroscopic and should be equilibrated to room temperature before opening to limit condensation on the solid. Solutions are typically prepared at milligram-per-millilitre concentrations and divided into single-use aliquots, because repeated freeze–thaw cycles degrade short peptides. Aqueous solutions are far less stable than the dry powder, and identity is usually verified by mass spectrometry alongside purity estimation from reversed-phase high-performance liquid chromatography.
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.
| Property | Value | Notes |
|---|---|---|
| Amino acid sequence | Ala-Glu-Asp-Gly | Linear tetrapeptide, also written AEDG |
| Molecular mass | About 390.35 g/mol | Value calculated from the sequence |
| Appearance | White to off-white powder | Lyophilised material forms a loose cake |
| Solubility | Freely soluble in water | Also dissolves in isotonic saline |
| Storage | -20 °C, desiccated | Aliquot solutions to avoid freeze–thaw cycling |
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.
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.
== Safety == Virucides are not intended for use inside the body, and most are disinfectants that are not intended for use on the surface of the body. Most substances are toxic. None of the listed substances replaces vaccination or antiviral drugs, if available. Virucides are usually labeled with instructions for safe, effective use. The correct use and scope of disinfectants is very important. Potential serious side-effects with using "quats" (Quaternary ammonium compounds) exist, and over-use "can have a negative impact on your customers' septic systems." Mouth-rinsing or gargling can reduce virus load, however experts warn that "Viruses in the nose, lungs or trachea that are released when speaking, sneezing and coughing are unlikely to be reached because the effect is based on physical accessibility of the surface mucous membrane". According to Deutsche Dermatologische Gesellschaft, medical practitioners recommend that disinfectants are gentler on the skin compared to soap-washing. The disinfected hands should then also be creamed to support the regeneration of the skin barrier. Skin care does not reduce the antiseptic effect of the alcoholic disinfectants. The "explosive" use of antibacterial cleansers has led the CDC to monitor substances in adults. On April 5, 2021, a Press Briefing by White House COVID-19 Response Team and Public Health Officials mentions that "Cleaning with household cleaners containing soap or detergent will physically remove germs from surfaces. This process does not necessarily kill germs, but reduces the risk of infection by removing them.
Everton, one of the top clubs in the English football league, were champions of the 1962–63 season, and it was done, according to a national newspaper investigation, with the help of Benzedrine. Word spread after Everton's win that the drug had been involved. The newspaper investigated, cited where the reporter believed it had come from, and quoted the goalkeeper, Albert Dunlop, as saying:
== Responses in Practice == Responses to illicit drug trafficking in the WIO are multifaceted, encompassing various approaches across law enforcement, prosecution, and capacity building. In regards to law enforcement in ports, many States are guided by the standards and measurements in the International Ship and Port Security (ISPS) code. However, authorised law enforcement at sea is more complex as it depends on where a vessel is registered and in what maritime zone the offence is committed, as well as which international agreements have been ratified by the responding state. State coalitions and navies are increasingly seen responding to drug trafficking corporately, while external drug agencies, such as the US Drug Enforcement Administration (DEA) and the UK’s National Crime Agency (NCA) are also present at different locations along the Southern Route with office locations. The most effective response to heroin trafficking in the WIO is the multinational naval coalition called Combined Maritime Forces Combines Task Force 150 (CMF). Due to the proportion of the WIO the CMF relies heavily on intelligence, as the area is simply too big to be present at all times. Additionally, the authorised boarding of a vessel requires permission from the flag state, which may decide to exercise its sovereignty and refuse the authorisation, limiting law enforcement practices. Challenges with prosecution persist due to the current law enforcement practices on the high sea.
=== Salt balance === Dermal macrophages facilitate skin homeostasis by regulating the skin's salt composition. For instance, an increase in salt concentration after a salt-heavy meal attracts dermal macrophages that express TonEBP, a transcriptional factor responding to osmotic pressure changes. This process triggers VEGF-C transcription, resulting in the growth of lymph capillaries and blood vessels dilation, regulating salt-sensitive hypertension by lowering the blood pressure. An increase in sodium ions concentration also facilitates the polymerisation of glycosaminoglycans, which helps the storage of sodium ions in the skin. A salt solution such as sodium chloride in the skin can trigger hypertonic stress, which acts as a stimulus for attracting macrophages. A higher salt concentration also causes macrophages activation. It induces the expression of pro-inflammatory genes such as CXCL-1, CCL2, and IL-1 and inhibits anti-inflammatory genes such as CCL18 and CCL22. Hence, the activation of dermal macrophages can be achieved by the local salt concentration, independent of the salt ingested. The expression of such genes could contribute to the skin's defence against parasitic infections.
The playground features train-themed equipment with an educational plaque explaining Jones' mobile refrigeration technology. In 2022, several Black-owned breweries honored Jones during Black History Month. They released commemorative beers featuring the likeness of notable figures in Black history, including Jones.
Sources: en.wikipedia.org
=== 2014 FDA Form 483 === In December 2014 the FDA issued a Form 483 letter over concerns discovered during an inspection of its Srikakulam facility. No specific violations were mentioned in the letter.
==== TP0126 ==== The TP0126 protein has been linked to the outer membrane protein family (OMP). This protein will sit in the outer membrane like a porin, which is supported by circular dichroism recombinant TP0126, and will increase the virulence factor. Researchers have classified the TP0126 protein in this class due to the homology between the protein and the porins of the OMPs. This protein is encoded by the TP0126 gene, which is conserved over all strains of T. pallidum.
It has been suggested that suicidal behavior and ideation may be associated with use of GLP-1 receptor-agonist medication, but studies in several countries since 2024 do not support this. In January 2026, the US Food and Drug Administration requested removal of a suicidal behavior and ideation warning from GLP-1 receptor-agonist medications.
=== Legal status === Pethidine is in Schedule II of the Controlled Substances Act 1970 of the United States as a Narcotic with ACSCN 9230 with a 6250 kilo aggregate manufacturing quota as of 2014. The free base conversion ratio for salts includes 0.87 for the hydrochloride and 0.84 for the hydrobromide. The A, B, and C intermediates in production of pethidine are also controlled, with ACSCN being 9232 for A (with a 6 gram quota) and 9233 being B (quota of 11 grams) and 9234 being C (6 gram quota). It is listed under the Single Convention for the Control of Narcotic Substances 1961 and is controlled in most countries in the same fashion as is morphine.
Sources: en.wikipedia.org
Methysticin is one of the six major kavalactones found in the kava plant. It enhances the activity of the GABAA receptor, acting as a positive modulator without affecting the benzodiazepine binding site. This effect is attributed to structural features such as its angular lactone ring and is similar in strength to other kavalactones like kavain and dihydromethysticin. Methysticin also induces the liver enzyme CYP1A1, which plays a role in the toxification of benzo[a]pyrene into a highly carcinogenic metabolite. However, such induction has not been observed in vivo in humans or animals. Additionally, methysticin is a mechanism-based inactivator of CYP2C9, irreversibly inhibiting the enzyme through NADPH-dependent reactive intermediates, suggesting potential interactions with medications metabolized by CYP2C9.
== Distribution and habitat == The distribution of algal species has been fairly well studied since the founding of phytogeography in the mid-19th century. Algae spread mainly by the dispersal of spores analogously to the dispersal of cryptogamic plants by spores. Spores can be found in a variety of environments: fresh and marine waters, air, soil, and in or on other organisms. Whether a spore is to grow into an adult organism depends on the species and the environmental conditions where the spore lands. The spores of freshwater algae are dispersed mainly by running water and wind, as well as by living carriers. However, not all bodies of water can carry all species of algae, as the chemical composition of certain water bodies limits the algae that can survive within them. Marine spores are often spread by ocean currents. Ocean water presents many vastly different habitats based on temperature and nutrient availability, resulting in phytogeographic zones, regions, and provinces. To some degree, the distribution of algae is subject to floristic discontinuities caused by geographical features, such as Antarctica, long distances of ocean or general land masses. It is, therefore, possible to identify species occurring by locality, such as "Pacific algae" or "North Sea algae". When they occur out of their localities, hypothesizing a transport mechanism is usually possible, such as the hulls of ships. For example, Ulva reticulata and U. fasciata travelled from the mainland to Hawaii in this manner.
== Early life and education == Nasatir was born in Santa Ana, California in 1903 to Jewish parents who had immigrated from Lithuania. He completed his Ph.D. at the University of California, Berkeley when he was 19. He largely studied under Herbert Eugene Bolton at UC Berkeley.
Sources: en.wikipedia.org
It is a synthetic tetrapeptide. Its sequence was derived from research on peptide fractions of bovine pineal extract, and the intact AEDG sequence has not been demonstrated as an abundant free peptide in human tissue.
AEDG is the one-letter code for the four amino acids alanine, glutamate, aspartate and glycine in that order. The same molecule is written in three-letter form as Ala-Glu-Asp-Gly.
Identity is normally confirmed by mass spectrometry against the calculated mass of roughly 390.35 g/mol. Purity is then estimated by reversed-phase high-performance liquid chromatography with ultraviolet detection.
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.