A practical reference on Epitalon: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-11-21. Anything still debated is marked as such rather than presented as settled.
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.
The proposed relationship between epitalon and pineal function is a central part of its background. Khavinson's group reported that short peptides corresponding to regions of larger pineal proteins could influence gene expression in cells. Epitalon was framed as a synthetic analogue of an active fragment rather than a direct isolation product. Whether the tetrapeptide reproduces the effects of the parent extract is an open question, because comparative studies are limited and the parent extract itself is not a single defined substance.
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.
| Property | Value | Notes |
|---|---|---|
| Amino acid sequence | Ala-Glu-Asp-Gly | Tetrapeptide, often abbreviated AEDG |
| Molecular formula | C14H22N4O9 | Free peptide, unmodified termini |
| Molecular weight | ~390.35 Da | Calculated for the free acid form |
| Appearance | White to off-white powder | Typical lyophilized product form |
| Solubility class | Freely soluble in water | Two acidic residues dominate ionic character |
Epitalon is a synthetic tetrapeptide whose sequence is alanine–glutamate–aspartate–glycine, commonly abbreviated AEDG. It was developed in Russia during the 1980s and 1990s by investigators associated with the St. Petersburg Institute of Bioregulation and Gerontology, who studied short peptides as regulators of gene expression and tissue function. The alternative spelling epithalon appears interchangeably in the literature, and the two names refer to the same molecule. Outside Russia it is encountered chiefly as a research chemical rather than a licensed medicine, and it holds no approval from the United States Food and Drug Administration or the European Medicines Agency.
The peptide is a synthetic analogue of epithalamin, a preparation extracted from bovine pineal glands. Investigators sought a short, chemically defined molecule that would reproduce some of the endocrine and gerontological observations attributed to the glandular extract. Proposed mechanisms centre on induction of telomerase activity, an effect reported in cultured human somatic cells in the early 2000s, together with influences on melatonin secretion and neuroendocrine regulation. Those mechanisms remain incompletely characterised, and the reported telomerase response has not been consistently reproduced by independent groups working in comparable systems.
Chemically, the molecule consists of four amino acid residues joined by three peptide bonds, with a free N-terminal amino group and a free C-terminal carboxyl group. Its molecular formula is C14H22N4O9, and its monoisotopic mass is approximately 390 daltons. The acidic glutamate and aspartate side chains give the peptide a net negative charge near neutral pH, a property that shapes its chromatographic behaviour and solubility profile. No disulfide bridges or other post-translational modifications are present, so the primary sequence alone defines the structure.
Most experimental work has been carried out in cell culture and animal models. Several reports describe changes in telomerase activity and proliferation in cultured cells, while rodent studies have examined lifespan, melatonin rhythm and reproductive endpoints. Human data remain limited, and much of the published clinical material consists of small trials with incomplete reporting of methods and controls. Whether the cell and animal findings translate into measurable effects in people is an open question, and the mechanistic basis of the reported telomerase changes is not fully established.
=== Fellows of ASMS (since 2025) === 2026 Veronica M. Bierbaum, Catherine E. Costello, Kristina Hakansson, Lisa M. Jones, Susan D. Richardson 2025 Erin S. Baker, Catherine C. Fenselau, P. Jane Gale, Susan Weintraub
−18 °C (0 °F) (freezer) 0 °C (32 °F) (meat zone) 5 °C (41 °F) (cooling zone) 10 °C (50 °F) (crisper) European freezers, and refrigerators with a freezer compartment, have a four-star rating system to grade freezers.
Each year, a joint 1st Special Forces Group-Canadian Special Operations Regiment exercise, known as Menton Week is held to commemorate the historical link that both units share in the First Special Service Force. While Filipino American guerrilla operations in the Japanese-occupied Philippines are not part of the direct lineage of Army Special Forces, some of the early Special Forces leadership had been involved with those operations. They would use what they had learned fighting as guerilla units in the doctrine of unconventional warfare in the Special Forces. They included Russell Volckmann, who commanded guerrillas in Northern Luzon and in Korea, Donald Blackburn, who also served with the Northern Luzon force, and Colonel Wendell Fertig, who developed a division-sized force on Mindanao.
Sources: en.wikipedia.org
=== Hepatitis B === Manufacturers recommend that hepatitis B vaccines be stored at 2-8 °C, but the vaccines actually tolerate ambient and even high temperatures for some amount of time. The use of vaccine vial monitors has helped health workers remain confident in vaccines being stored outside the cold chain.
=== Influence of temperature, relative humidity and rate of air circulation === The external drying conditions (temperature, relative humidity and air velocity) control the external boundary conditions for drying, and hence the drying rate, as well as affecting the rate of internal moisture movement. The drying rate is affected by external drying conditions, as will now be described.
While Operation Hooper was underway in late January 1988, Crocker relented to pressure and accepted Cuba as an equal partner in further peace talks. Castro agreed that he would not introduce extraneous issues to the agenda, such as Cuba–US relations, and that discussion of a phased troop withdrawal would extend to all Cuban military personnel stationed in Angola, including combat troops, logistical staff, and advisers. With Cuba's entry into the Brazzaville talks, its desire to shift its military involvement in Angola from a passive, defensive role to an offensive one intensified. Castro opted to escalate ground operations against the SADF, since he considered diplomatic progress impossible as long as South Africa still clung to the likelihood of a tactical victory. He retained a solely defensive posture at Cuito Cuanavale, keeping the SADF fixed in place, while carrying out his longstanding proposal to launch a flanking manoeuvre towards the South West African border. The new offensive would consist of a movement of Cuban forces in divisional strength west of the Cunene River. On 9 March, Castro ordered all Cuban troops massed at Lobito, which had grown to about 40,000 men, southward. He likened their movement to "a boxer who with his left hand blocks the blow [at Cuito Cuanavale] and with his right – strikes [in the west]".
Sources: en.wikipedia.org
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.
No. Epitalon is chemically synthesized, not extracted. It was designed as a short synthetic fragment conceptually related to larger pineal peptides studied in the same research tradition, particularly the extract known as epithalamin. The two are distinct materials with different compositions.
The term bioregulator is used in this research tradition for short peptides proposed to influence gene expression or cell function. Epitalon is grouped with other synthetic short peptides under this label. The term reflects a proposed mechanism rather than an established drug classification.
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.