If you have been reading about Epithalamin and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-04-23. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Storage temperature, solid | Approximately -20 C | Sealed, desiccated, protected from light |
| Typical identity method | Electrospray mass spectrometry | Protonated ion expected near 391 |
| Typical purity method | Reversed-phase HPLC | Ultraviolet detection near 214 nm |
| Common synonyms | Epithalon, epithalone, AEDG | Spelling variants appear in supplier catalogues |
| Solution stability | Days at 2-8 C | Hydrolysis and deamidation limit shelf life |
No national medicines regulator has approved epitalon as a therapeutic product. It is generally distributed as a research chemical, and in some jurisdictions selling peptides for human consumption without approval is restricted or prohibited. Certificates of analysis accompanying commercial material vary in which tests are performed, and independent verification of identity and purity is uncommon. Statements about anti-ageing or disease-prevention benefits on vendor pages are marketing claims rather than regulatory findings, a distinction that shapes how the compound is discussed in scientific and popular sources alike.
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.
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.
Epitalon is a synthetic linear tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, abbreviated AEDG. Its molecular formula is C14H22N4O9 and the calculated mass is approximately 390.35 g/mol. The compound is made by solid-phase peptide synthesis rather than extracted from tissue, although early work described it as a short fragment of a peptide fraction obtained from bovine pineal extract. In the research literature the spelling epitalon and the variant epithalone both appear, while AEDG is the standard code used in peptide nomenclature.
== Oil == Peppermint oil has a high concentration of natural pesticides, mainly pulegone found mostly in "M. arvensis var. piperascens" (Mentha canadensis), and to a lesser extent in Mentha × piperita and menthone. It is known to repel some pest insects, including mosquitos. Main constituents of the essential oil from Mentha × piperita are menthol (41%) and menthone (23%). The oil is used in flavours and fragrances. Its aroma defines "peppermint".
==== Remote monitoring ==== Spectrometers on earth-observation satellites allow monitoring of formaldehyde in the troposphere. Using ultraviolet–visible spectroscopy, instruments detect absorption features in sunlight reflected by the Earth and use differential optical absorption spectroscopy to calculate vertical column densities. Near-global maps of tropospheric HCHO with daily coverage and kilometer-scale spatial resolution come from the OMI instrument on Aura, the GOME-2 instrument on MetOp, and the newer TROPOMI sensor on Sentinel-5P. Regional maps with hourly coverage over North America are available from the TEMPO instrument on Intelsat 40e. The close coupling between isoprene and formaldehyde has been widely used in top-down approaches that derive regional and global isoprene emissions from satellite measurements of tropospheric formaldehyde columns. These studies provide important constraints on the magnitude and spatial pattern of biogenic isoprene emissions. Processes in the upper atmosphere contribute more than 80% of the total formaldehyde in the environment. Formaldehyde is an intermediate in the oxidation (or combustion) of methane and other carbon compounds from sources such as forest fires, automobile exhaust, and tobacco smoke. When produced in the atmosphere by the action of sunlight and oxygen on atmospheric methane and other hydrocarbons, it becomes part of smog. Formaldehyde has also been detected in outer space.
Soybean meal, or soymeal, is the material remaining after solvent extraction of oil from soybean flakes, with a 50% soy protein content. The meal is 'toasted' (a misnomer because the heat treatment is with moist steam) and ground in a hammer mill. Ninety-seven percent of soybean meal production globally is used as livestock feed. Soybean meal is also used in some dog foods.
boiling flask Also Florence flask. A type of flask, usually made of glass, with a large round body, long neck, and flat bottom, designed especially for heating, boiling, and distilling liquids and to make swirling easy. See also round-bottom flask.
== Medicine and biotechnology == Aminopeptidase has been studied for use in treating hypertension, inflammation, and some cancers. Aminopeptidase A (APA) is implicated in blood pressure regulation by converting angiotensin II to angiotensin III. APA inhibitors are being explored as potential antihypertensive agents, offering a novel approach to managing hypertension. Aminopeptidase N (APN) has been associated with the pathogenesis of inflammatory diseases such as rheumatoid arthritis and inflammatory bowel disease. Inhibitors of APN have demonstrated anti-inflammatory effects in animal models, positioning them as potential therapeutic agents for these conditions. Several aminopeptidases, including APN, APA, and leucine aminopeptidase (LAP), are overexpressed in various cancers. Their involvement in tumor growth, invasion, and angiogenesis makes them attractive targets for cancer therapy. Aminopeptidase inhibitors have shown promise in preclinical studies as potential anticancer agents.
Sources: en.wikipedia.org
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Cefadroxil (formerly trademarked as Duricef) is a broad-spectrum antibiotic of the cephalosporin type, effective in Gram-positive and Gram-negative bacterial infections. It is a bactericidal antibiotic. It was patented in 1967 and approved for medical use in 1978.
And when I got it, I didn't miss it." The Astros and Bagwell agreed to a four-year contract on November 23, 1994, worth $27.5 million (USD, $59.7 million today) with the three option years. The average annual value of $6.875 million ($14.9 million today) made him the fifth-highest paid player in the majors.
=== Cancer and Infectious Diseases === A significant area of LMRT's work involves developing nanomaterials as tools for biological studies and as multifunctional agents for cancer therapies. This includes designing nanoparticles and nanoporous materials that can home in on tumors, signal cellular changes, enhance imaging, or deliver therapeutic components. Early work in 2002, with Erkki Ruoslahti, involved developing phage-derived peptide-targeted nanomaterials for in vivo tumor targeting. More recently, Bhatia, in collaboration with Erkki Ruoslahti and Michael Sailor, has explored engineering beneficial probiotics to detect or treat cancer cells. For over a decade, LMRT has pioneered new technologies in activity-based diagnostics. This includes designing nanosensors with biological molecules, such as peptide barcodes, that can signal the presence of diseases like cancer when interacting with aberrantly active enzymes (proteases) in diseased tissue. These specialized nanoparticles allow for detection via simple tests on urine similar to an at-home pregnancy test, breath, or blood samples. This platform has expanded to detect 12 diseases, including 6 cancer types. Nanosensors can be administered via inhalation, intramuscular injection, and even ingested in the form of probiotic bacteria. The LMRT is also exploring breath-based diagnostics for rapid results and has developed diagnostic tools that use DNA barcodes and CRISPR technology, making cancer diagnostics more affordable and accessible for low- and middle-resource settings.
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Sources: en.wikipedia.org
On September 25, Xi and Peng returned to the White House with Donald and Melania Trump. They then attended a tea ceremony in the Red Room. Trump said US farmers "are going to be very happy" with the talks, adding "A lot of very positive things happened, but America is very happy about this visit and I’m sure China is very happy also". He said "We’ve had a tremendous visit from two spectacular people" and "We’ve really enjoyed it and I think we’ve been tremendous strides. We’ve made great strides, very positive for both countries." During this tea ceremony, Xi said that he and Trump "are like two people who are charting the course for the great ship of China-U.S. relations." Xi also confirmed that two leaders will to see each other later this year in twice, including APEC summit in Shenzhen and G20 Summit in Miami. Later, Xi and Trump visited the National Archives, and viewed the Declaration of Independence, the Constitution and the Bill of Rights. According to the NPR, a table that included a temporary display showcasing a brick from the Great Wall of China and an 19th century scroll sent by a Qing emperor was removed because the display also planned to show the Treaty of San Francisco, which China considers as illegitimate because it was not a signatory. Other documents, including Six Assurances and the Three Communiqués, were also discussed for display, but ultimately not included.
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== Erinacine A == Erinacine A, isolated from the cultured mycelia of Hericium erinaceus, the main representative of this compounds group, has an enhancing effect on nerve growth factor synthesis in vitro. It also increases the levels of catecholamines in the central nervous system of rats.. Erinacine A has been observed to lead to the activation of antioxidant pathways including the transcription factor Nrf2. Stimulator of nerve growth factor (NGF) synthesis in vitro((250.1 ± 36.2) pg/mL at 1.0 mmol/L), weak cytotoxicity against PC12 cells (IC50: 73.7 μmol/L), Anti‐methicillin-resistant Staphylococcus aureus (MRSA) activity Erinacine A has also been prepared by total synthesis.
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Sources: en.wikipedia.org
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.
Reversed-phase chromatography with ultraviolet detection gives a purity percentage, while mass spectrometry confirms identity. Amino acid analysis checks the residue composition. Buyers typically request a certificate of analysis showing these measurements for the specific lot.
It is not authorised as a medicine in the United States or the European Union. Material is sold there as a research chemical or cosmetic ingredient. Some related short peptides are registered drugs in Russia, which is a distinct national situation rather than a general approval.
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.