Everything below concerns Epithalamin. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-05-13. 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.
Epitalon is a synthetic tetrapeptide with the amino acid sequence alanine-glutamate-aspartate-glycine, abbreviated Ala-Glu-Asp-Gly or AEDG. It was developed by the Russian researcher Vladimir Khavinson and colleagues during work on peptide bioregulators derived from the pineal gland. The compound is short enough to be produced by standard solid-phase peptide synthesis and is typically handled as a lyophilized white powder. Its small size distinguishes it from larger pineal peptides such as epithalamin, a complex extract from which the tetrapeptide was conceptually derived.
The four residues give epitalon a molecular formula of C14H22N4O9 and a molecular weight near 390.35 daltons. The presence of two acidic residues, glutamate and aspartate, makes the free peptide strongly acidic, while the alanine and glycine ends provide neutral, nonpolar character. This combination produces a molecule with substantial water solubility. Because there are no cysteine, methionine, or tryptophan residues, the peptide lacks the most common oxidation-sensitive side chains, which simplifies handling compared with many longer peptides.
| 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 |
In its supplied form epitalon is a white to off-white powder, usually lyophilized and often hygroscopic. It dissolves readily in water and in aqueous buffers, and it is commonly handled as the acetate or trifluoroacetate salt to improve stability during purification and drying. The amide backbone is labile in aqueous media, so solutions are less durable than the dry solid. Handling notes in the chemical literature therefore emphasize keeping the powder dry, cool and shielded from light until it is dissolved.
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.
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.
To avoid transfusion reactions, the donor and recipient blood are tested, typically ordered as a "type and screen" for the recipient. The "type" in this case is the ABO and Rh type, specifically the phenotype, and the "screen" refers to testing for atypical antibodies that might cause transfusion problems. The typing and screening are also performed on donor blood. The blood groups represent antigens on the surface of the red blood cells which might react with antibodies in the recipient. The ABO blood group system has four basic phenotypes: O, A, B, and AB. In the former Soviet Union these were called I, II, III, and IV, respectively. There are two important antigens in the system: A and B. Red cells without A or B are called type O, and red cells with both are called AB. Except in unusual cases like infants or seriously immunocompromised individuals, all people will have antibodies to any ABO blood type that isn't present on their own red blood cells, and will have an immediate hemolytic reaction to a unit that is not compatible with their ABO type. In addition to the A and B antigens, there are rare variations which can further complicate transfusions, such as the Bombay phenotype. The Rh blood group system consists of around 50 different antigens, but that of the greatest clinical interest is the "D" antigen, though it has other names and is commonly just called "negative" or "positive". Unlike the ABO antigens, a recipient will not usually react to the first incompatible transfusion because the adaptive immune system does not immediately recognize it.
== Signs and symptoms == Obesity is the chief symptom of HAIR-AN. In the majority of young women affected by HAIR-AN, hyperandrogenism leads to oily skin, acne, hirsutism, menstrual irregularities and, in some cases, androgenic alopecia, clitoromegaly, changes in muscle mass and deepening of the voice. Insulin resistance can be accompanied by normal or elevated levels of glucose. Symptoms of diabetes such as polydipsia, polyuria and weight loss may sometimes be present.
Acting on the nuclear mineralocorticoid receptors (MR) within the principal cells of the distal tubule and the collecting duct of the kidney nephron, it upregulates and activates the basolateral Na+/K+ pumps, which pumps three sodium ions out of the cell, into the interstitial fluid and two potassium ions into the cell from the interstitial fluid. This creates a concentration gradient which results in reabsorption of sodium (Na+) ions and water (which follows sodium) into the blood, and secreting potassium (K+) ions into the urine (lumen of collecting duct). Aldosterone upregulates epithelial sodium channels (ENaCs) in the collecting duct and the colon, increasing apical membrane permeability for Na+ and thus absorption. Cl− is reabsorbed in conjunction with sodium cations to maintain the system's electrochemical balance. Aldosterone stimulates the secretion of K+ into the tubular lumen. Aldosterone stimulates Na+ and water reabsorption from the gut, salivary and sweat glands in exchange for K+. Aldosterone stimulates secretion of H+ via the H+/ATPase in the intercalated cells of the cortical collecting tubules Aldosterone upregulates expression of NCC in the distal convoluted tubule chronically and its activity acutely. Aldosterone is responsible for the reabsorption of about 2% of filtered sodium in the kidneys, which is nearly equal to the entire sodium content in human blood under normal glomerular filtration rates. Aldosterone, probably acting through mineralocorticoid receptors, may positively influence neurogenesis in the dentate gyrus.
=== Religion === Head-shaving (tonsure) is a part of some Buddhist, Christian, Muslim, Jain and Hindu traditions. Buddhist and Christian monks generally undergo some form of tonsure during their induction into monastic life. Within Amish society, tradition ordains men to stop shaving a part of their facial hair upon marriage and grow a Shenandoah style beard which serves the significance of wearing a wedding ring; moustaches are rejected as they are regarded as martial (traditionally associated with the military). In Judaism (see Shaving in Judaism), there is no obligation for women to remove body hair or facial hair, unless they wish to do so. However, in preparation for a woman's immersion in a ritual bath after concluding her days of purification (following her menstrual cycle), the custom of Jewish women is to shave off their pubic hair. During a mourning ritual, Jewish men are restricted in the Torah and Halakha to using scissors and prohibited from using a razor blade to shave their beards or sideburns, and, by custom, neither men nor women may cut or shave their hair during the shiva period. The Baháʼí Faith recommends against complete and long-term head-shaving outside of medical purposes. It is not currently practiced as a law, contingent upon a future decision by the Universal House of Justice, its highest governing body. Sikhs take an even stronger stance, opposing all forms of hair removal. One of the "Five Ks" of Sikhism is Kesh, meaning "hair".
Sources: en.wikipedia.org
== Plot summary == The novel begins with a brief prologue describing the bioforms—dubbed the First-Born—who created the black monoliths. They evolved from "primordial soup", and over the course of millions of years became a space-faring species. Perceiving that nothing was more precious than the mind, they catalysed the evolution of intelligent species wherever they went, by increasing the intelligent species' chance of survival. After visiting Earth, the First-Born found a way to impress themselves into the fabric of space and time, becoming effectively immortal. Meanwhile, the monoliths—implied to have been forgotten by their creators when they ascended to a higher state of being—continued to watch over their subjects. 3001 follows the adventures of Frank Poole, the astronaut killed by the HAL 9000 computer in 2001: A Space Odyssey. One millennium later, Poole's freeze-dried body is discovered floating in the Kuiper belt by a comet-collecting space tug named the Goliath, and revived. The resurrected Poole is taken home to learn about the Earth in the year 3001. Some of its notable features include the BrainCap, a brain–computer interface technology; genetically engineered dinosaur servants; and four gigantic space elevators located evenly around the Equator. Humans have also colonised the Jovian moons Ganymede and Callisto. TMA-1, the black monolith found on the Moon in 1999, had been brought to Earth in 2006 and installed in front of the United Nations Building in New York City.
=== EC 2.4.99: Transferring Other Glycosyl Groups === EC 2.4.99.1: β-galactoside α-(2,6)-sialyltransferase EC 2.4.99.2: β-D-galactosyl-(1→3)-N-acetyl-β-D-galactosaminide α-2,3-sialyltransferase EC 2.4.99.3: α-N-acetylgalactosaminide α-2,6-sialyltransferase EC 2.4.99.4: β-galactoside α-2,3-sialyltransferase EC 2.4.99.5: galactosyldiacylglycerol α-2,3-sialyltransferase EC 2.4.99.6: N-acetyllactosaminide α-2,3-sialyltransferase EC 2.4.99.7: α-N-acetylneuraminyl-2,3-β-galactosyl-1,3-N-acetylgalactosaminide 6-α-sialyltransferase EC 2.4.99.8: α-N-acetylneuraminate α-2,8-sialyltransferase EC 2.4.99.9: lactosylceramide α-2,3-sialyltransferase EC 2.4.99.10: Now included in EC 2.4.99.6, N-acetyllactosaminide α-2,3-sialyltransferase EC 2.4.99.11: Now included with EC 2.4.99.1,β-galactoside α-(2,6)-sialyltransferase EC 2.4.99.12: lipid IVA 3-deoxy-D-manno-octulosonic acid transferase EC 2.4.99.13: (Kdo)-lipid IVA3-deoxy-D-manno-octulosonic acid transferase EC 2.4.99.14: (Kdo)2-lipid IVA (2-8) 3-deoxy-D-manno-octulosonic acid transferase EC 2.4.99.15: (Kdo)3-lipid IVA (2-4) 3-deoxy-D-manno-octulosonic acid transferase EC 2.4.99.16: starch synthase (maltosyl-transferring) EC 2.4.99.17: S-adenosylmethionine:tRNA ribosyltransferase-isomerase EC 2.4.99.18: dolichyl-diphosphooligosaccharide—protein glycotransferase EC 2.4.99.19: undecaprenyl-diphosphooligosaccharide—protein glycotransferase EC 2.4.99.20: 2′-phospho-ADP-ribosyl cyclase/2′-phospho-cyclic-ADP-ribose transferase EC 2.4.99.21: dolichyl-phosphooligosaccharide-protein glycotransferase EC 2.4.99.22: N-acetylglucosaminide α-(2,6)-sialyltransferase
==== Germany ==== As of August 2024, 1S-LSD remains legal in Germany, primarily due to the fact that its unique silicon-containing structural alteration circumvent the legislative controls imposed by the NpSG law. The legal status of 1S-LSD in Germany is likely subject to change with future amendments to the NpSG, similarly to its previously banned sister compounds 1V-LSD and 1D-LSD. However, it is anticipated that 1S-LSD will remain legal at least until mid-2025. An update on the 21st of November 2025 added 1S-LSD to the "NpSG" made the sale illegal in Germany ("sechste Verordnung zur Änderung der Anlage des Neue-psychoaktive-Stoffe-Gesetzes (NpSG)").
Meso-zeaxanthin is produced at an industrial level from the lutein obtained from marigold petals. The process involves saponification, which is carried out using high temperature and a high concentration of base, leads to the isomerization of the 4′-5′ double bond to the 5′-6′ position. This converts the ɛ-ring of lutein into a β-ring, thus converting lutein into meso-zeaxanthin. The stereochemistry of this zeaxanthin is determined by the position of the hydroxyl group at the 3´ position, which results in the "S" designation for the final zeaxanthin molecule. The stereoisomer produced by this process is 3R,3′S-zeaxanthin (i.e., meso-zeaxanthin). The conditions of saponification can be modulated to increase or decrease the conversion rate of lutein into meso-zeaxanthin.
Promote their own products as healthy and unique, by clearly distinguishing their health claims from similar products, and by specifying naturally healthy ingredients. Consider extensions of existing brand lines. For example, Nestle extended their Boost product line by adding Kids Essentials to the line, thereby extending the adult-focused Boost line to a new market (children). Larger companies compete for market share by acquiring smaller companies that may own a particular market sector. For example, Coca-Cola purchased Glaceau from Energy Brands, and Odwalla, and Fuze Beverage from their respective founders, in order to increase Coca-Cola's market share. Explore new functional brands by identifying new markets and demands. Market segments of the functional beverage industry are divided mainly into four parts. Those include hydration, energy and rejuvenation, health and wellness, and weight management. Each segment has its own target market and consumers. Overlapping of target consumers does occur—not because of undefined market needs, but due to consumer acceptance of functional beverages.
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.
Epitalon is a synthetic tetrapeptide composed of four amino acids: alanine, glutamate, aspartate, and glycine. It is written as Ala-Glu-Asp-Gly. The free peptide has a molecular weight of about 390 daltons and is normally supplied as a lyophilized powder.