A practical reference on Epithalamin: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-05-13. Anything still debated is marked as such rather than presented as settled.
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.
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 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.
| 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 |
=== Dosage === For adult patients with attention deficit hyperactivity disorder (ADHD), the initial dose of atomoxetine should be 40 mg daily. The dose should be increased after a minimum of 3 days to a target dose of 80 mg daily as a single dose in the morning. The 80 mg/day can also be taken in two divided doses in the morning and late afternoon. After 2–4 weeks the dose may be increased to 100 mg/day but doses over 100 mg/ day are not suggested. In the use of atomoxetine in children (6 years or older up to 70 kg) with attention-deficit hyperactivity disorder, acute treatment should be started with approximately 0.5 mg/kg orally daily. The dose should be increased after a minimum of 3 days up to approximately 1.2 mg/kg daily (target dose) as a single or two divided doses (in the morning and late afternoon). For children older than 6 years old, over 70 kg, acute treatment should be started with 40 mg/day orally and increased up to 80 mg/day after a minimum of 3 days. The dose can be taken as a single dose in the morning or in two divided doses (in the morning and late afternoon). After 2–4 weeks the dose can be increased to 100 mg/ daily. In the use of reboxetine for depression, clinical studies have shown that most patients are treated with an initial dose of reboxetine 8 mg/day, most often as a divided dose. Depending upon patient tolerance and need, the dose can be increased up to 10 mg/day. Doses over 12 mg/day are not recommended. Doses should be adjusted in renal failure, hepatic insufficiency and in geriatric patients.
"Freeze" debuted at number 38 on the Billboard Hot 100 in the US with downloads only, and also debuted at number 45 on the Canadian Hot 100 and number 62 on the UK Singles Chart due to digital downloads in those countries. Also in the US it charted on the Hot R&B/Hip-Hop Songs after its physical release at number 39. It has been most successful in Australia and New Zealand peaking at number 26 and number 23 respectively.
An aglycone (aglycon or genin) is the chemical compound remaining after the glycosyl group on a glycoside is replaced by a hydrogen atom. For example, the aglycone of a cardiac glycoside would be a steroid molecule.
Kidney dialysis is the process of removing excess water, solutes, and toxins from the blood in people whose kidneys can no longer perform these functions naturally. Along with kidney transplantation, it is a type of renal replacement therapy. Dialysis may need to be initiated when there is a sudden rapid loss of kidney function, known as acute kidney injury (previously called acute renal failure), or when a gradual decline in kidney function, chronic kidney failure, reaches stage 5. Stage 5 chronic renal failure is reached when the glomerular filtration rate is less than 15% of the normal, creatinine clearance is less than 10 mL per minute, and uremia is present. Dialysis is used as a temporary measure in cases of acute kidney injury or for those awaiting kidney transplant and as a permanent measure in those for whom a transplant is not indicated or not possible. In West European countries, Australia, Canada, the United Kingdom, and the United States, dialysis is paid for by the government for those who are eligible. The first successful dialysis was performed in 1943.
Sources: en.wikipedia.org
Tellurocysteine (in some publications referred to as Te-Cys) is an amino acid with the formula HTeCH2CH(NH2)CO2H. It is the heavy analogue of serine, cysteine, and selenocysteine. Tellurol (RTeH) is a rare and fragile functional group, especially alkyl derivatives. The C-Te bond (200 kJ/mol) is weak compared to 234 kJ/mol for the C-Se bond. These factors combine to make tellurocysteine very labile. Even selenocysteine occurs only rarely in nature. Instead of tellurocysteine, tellurocystine is generally isolated instead. Tellurocystine has the formula (TeCH2CH(NH2)CO2H)2, with a central Te-Te bond.
=== Decriminalization and personal use === In 1976, the Netherlands' policy of tolerance of limited cannabis sale and personal use came into practice. The Dutch government amended the country's Opium Act to consider cannabis as a "soft drug" and permitted gedoogbeleid (Dutch: "tolerance policy"). Trafficking and possession of cannabis remained illegal; cannabis laws were not enforced for sale of small quantities for on-site use in coffeeshops. The INCB criticism of the Dutch system has been ongoing. One annual report called it "an activity that might be described as indirect incitement. This is not in accordance with the spirit or the letter of the international drug control treaties." In 2001, Portugal decriminalized purchase and possession for personal use of all psychoactive drugs. It maintained its treaty obligations by changing the form of prohibition from criminal law to administrative law, replacing criminal penalties with fines, reporting requirements, and treatment referrals; drugs still had to be obtained from illegal sources, as selling remained a criminal act. Initially taking a negative view, the INCB in 2005 accepted the policy as legitimate, finding that "the practice of exempting small quantities of drugs from criminal prosecution is consistent with the international drug control treaties". Some two dozen countries have taken similar approaches to decriminalizing cannabis and other drugs for personal consumption.
For example, if it is predicted that the transition state structure has a build-up of negative charge relative to the ground state structure, then electron-donating groups would be expected to increase the rate of the reaction. Other LFER scales have been developed. Steric and polar effects are analyzed through Taft Parameters. Changing the solvent instead of the reactant can provide insight into changes in charge during the reaction. The Grunwald-Winstein Plot provides quantitative insight into these effects.
==== Federal and large-scale ==== Several different organizations exist to mitigate and respond to food distribution crises in the United States. Prominent contributors to large-scale food distribution effort in the US include the Federal Emergency Management Agency (FEMA), United States Department of Agriculture (USDA), and Salvation Army. FEMA and the USDA work together during food distribution crises to coordinate the procurement and transportation of nonperishable food, water, and other resources to afflicted areas. The Salvation Army receives federal supplies from FEMA and the USDA, and then works on the local level to distribute necessary goods. All food given to civilians during a crisis is typically distributed at mass emergency feeding stations.
Danish Defence developed a modern field ration inspired by Norwegian and American rations. It consist of Drytech freeze-dried main meals and several additional items such as dried fruits and nuts, energy bars, hard biscuits, meat pâté, etc.
Sources: en.wikipedia.org
It is commonly used in lieu of boric acid and can be used to help control and possibly eliminate bed bugs, house dust mite, cockroach, ant, and flea infestations. Diatomaceous earth is widely applied for insect control in grain storage. It is used to control cannibalistic behaviors in confused flour beetles, which infest flour storages. To be effective as an insecticide, diatomaceous earth must have a mean particle size below about 12 μm (i.e., food grade—see below); and it must be uncalcinated (i.e., it must not be heat-treated prior to application). Although considered to be relatively low-risk, pesticides containing diatomaceous earth are not exempt from regulation in the United States under the Federal Insecticide, Fungicide, and Rodenticide Act and must be registered with the Environmental Protection Agency.
Scott at the University of Chicago tried aqueous pancreatic extracts and noted "a slight diminution of glycosuria", but was unable to convince his director of his work's value; it was shut down. Israel Kleiner demonstrated similar effects at Rockefeller University in 1915, but World War I interrupted his work and he did not return to it. In 1916, Nicolae Paulescu developed an aqueous pancreatic extract which, when injected into a diabetic dog, had a normalizing effect on blood sugar levels. He had to interrupt his experiments because of World War I, and in 1921 he wrote four papers about his work carried out in Bucharest and his tests on a diabetic dog. Later that year, he published "Research on the Role of the Pancreas in Food Assimilation". The name "insulin" was coined by Edward Albert Sharpey-Schafer in 1916 for a hypothetical molecule produced by pancreatic islets of Langerhans (Latin insula for islet or island) that controls glucose metabolism. Unbeknown to Sharpey-Schafer, Jean de Meyer had introduced the very similar word "insuline" in 1909 for the same molecule.
An aphrodisiac is a substance that increases libido, sexual desire, sexual attraction, sexual pleasure, or sexual behavior. These substances range from a variety of plants, spices, and foods to synthetic chemicals. Natural aphrodisiacs, such as cannabis or cocaine, are classified into plant-based and non-plant-based substances. Synthetic aphrodisiacs include MDMA and methamphetamine. Aphrodisiacs can be classified by their type of effects (psychological or physiological). Aphrodisiacs that contain hallucinogenic properties, such as bufotenin, have psychological effects that can increase sexual desire and sexual pleasure. Aphrodisiacs that have smooth muscle relaxing properties, such as yohimbine, have physiological effects that can affect hormone concentrations and increase blood flow. Substances that have the opposite effects on libido are called anaphrodisiacs. Aphrodisiac effects can also be due to the placebo effect. Both males and females can potentially benefit from the use of aphrodisiacs, but they are more focused on males, as their properties tend to increase testosterone concentrations rather than estrogen concentrations. This is in part due to the historical context of aphrodisiacs, which focused solely on males. Only recently has attention been paid to understanding how aphrodisiacs can aid female sexual function. In addition, cultural influences on appropriate sexual behavior of males and females also play a part in the research gap.
== Nomenclature == This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is 2-dehydro-3-deoxy-D-gluconate:NAD+ 5-oxidoreductase. Other names in common use include 2-keto-3-deoxygluconate 5-dehydrogenase, 2-keto-3-deoxy-D-gluconate dehydrogenase, 2-keto-3-deoxygluconate (nicotinamide adenine dinucleotide, (phosphate)) dehydrogenase, 2-keto-3-deoxy-D-gluconate (3-deoxy-D-glycero-2,5-hexodiulosonic, and acid) dehydrogenase.
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.
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.