epithalamin is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2026-04-23. Where a claim depends on a specific study, the study is described rather than over-claimed.
Epitalon emerged from research conducted in Saint Petersburg by Vladimir Khavinson and colleagues, who studied short peptides as potential regulators of aging. The work built on epithalamin, a pineal gland extract reported to influence neuroendocrine function. Epitalon was designed as a synthetic counterpart with a defined sequence, allowing reproducible experiments that extracts could not support. Early publications described effects on melatonin rhythms and lifespan in animal models. These findings circulated mainly in Russian-language journals during the 1990s, which limited their visibility among English-speaking researchers.
The most widely cited claim is that epitalon activates telomerase and thereby extends telomere length. Supporting evidence comes largely from cultured human cells, where treatment was associated with increased telomerase activity and delayed replicative senescence. Telomerase activation is a biologically consequential effect, since the enzyme is largely silenced in most somatic cells. However, the route by which a short peptide would reach and act on the enzyme's regulatory machinery has not been established. Independent replication in human trials is scarce, so the link between cell-culture observations and whole-body aging remains 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.
| Property | Value | Notes |
|---|---|---|
| Peptide sequence | Ala-Glu-Asp-Gly | Single-letter form AEDG |
| Compound class | Synthetic tetrapeptide | Not a natural free peptide |
| Research origin | Russian gerontology institutes | Developed during the 1990s |
| Main research claim | Telomerase activation | Evidence mainly from cultured cells |
| Regulatory status | Not an approved drug | Handled as a research material |
Laboratory handling begins with dissolution of the lyophilized powder in water or a suitable aqueous buffer. The dry solid is the more stable form, so stock solutions are generally prepared only when required and kept cold afterwards. Repeated freezing and thawing of a solution is avoided because it encourages aggregation and gradual loss of the intact chain. Diluents and containers are selected to limit adsorption of a short peptide onto plastic surfaces and to reduce microbial growth in aqueous preparations.
Stability depends strongly on pH, temperature and the presence of oxygen and trace metals. Cleavage of the backbone proceeds faster under neutral to alkaline conditions, whereas acidic solutions tend to slow that reaction. The aspartate and glutamate side chains can undergo deamidation or imide formation over time, generating closely related impurities. Published stability data specific to epitalon are sparse, so the usable life of a given solution is best regarded as an open question that depends on buffer composition, concentration and storage temperature.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography with ultraviolet detection, frequently near 214 nanometers where the peptide bond absorbs. Mass spectrometry, most often with electrospray ionization, confirms the observed molecular mass and helps separate the intact peptide from truncated or modified forms. Amino acid analysis or tandem mass spectrometry can establish residue order. Purity is commonly quoted as an area percentage, yet such values are method-dependent, and comparisons between laboratories require matching column, gradient and detection wavelength.
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.
Purity assessment of peptide reagents normally relies on reversed-phase high-performance liquid chromatography. A gradient of acetonitrile in water with trifluoroacetic acid, paired with a C18 stationary phase, separates the target tetrapeptide from truncated sequences and deletion analogues. Detection at 214 nanometres exploits absorbance of the peptide backbone, since the molecule contains no aromatic residue. Results are expressed as a percentage of total peak area. Values above ninety-five percent are typical for research-grade material, although reporting conventions vary between suppliers.
Identity confirmation uses mass spectrometry, usually electrospray ionisation in positive mode or matrix-assisted laser desorption. The protonated free peptide produces a signal near three hundred and ninety-one daltons, while salt adducts shift that value slightly. Tandem mass spectrometry or amino acid analysis supplies sequence-level confirmation, which a single mass measurement cannot. Peptides containing aspartate can cyclise into succinimide intermediates that hydrolyse to isoaspartate isomers of identical mass. Because those isomers are difficult to separate chromatographically, identity and purity results carry more weight when interpreted together.
Storage practice centres on limiting moisture, oxygen, and repeated temperature cycling. Freeze-dried powder is generally held desiccated at minus twenty degrees Celsius or colder and protected from light. Reconstituted solutions are markedly less stable, and the aspartate-glycine junction is prone to succinimide formation at neutral to mildly alkaline pH. Portioning material into single-use aliquots reduces degradation compared with repeated freeze-thaw cycles. Stability data specific to this tetrapeptide remain scarce, so most handling guidance is extrapolated from general peptide chemistry rather than measured directly.
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.
62. Neuro Endocrinol Lett. 2001 Aug;22(4):251-4. Synthetic tetrapeptide epitalon restores disturbed neuroendocrine regulation in senescent monkeys. Khavinson V(1), Goncharova N, Lapin B. Author information: (1)St. Petersburg Institute of Bioregulation and Gerontology, 3 Dynamo Prospect, 197110 St. Petersburg, Russia. ibg@medport.ru The OBJECTIVE of this research was to investigate the regulatory effect of Epitalon on the production of melatonin and cortisol in senescent monkeys. MATERIAL AND METHODS: We investigated the character of melatonin and cortisol secretion by immunoferment assay in Epitalon-administered female Macaca mulatta in different age periods. RESULTS: Epitalon was proven to significantly stimulate melatonin synthesis in senescent monkeys in the evening, thereby normalising the circadian rhythm of cortisol secretion.
17. Adv Gerontol. 2014;27(3):399-406. [Peptides and CCL11 and HMGB1 as molecular markers of aging: literature review and own data]. [Article in Russian] Khavinson VKh, Kuznik BI, Tarnovskaia SI, Lin'kova NS. Cytokines CCL11 (eotaxin) and HMGB1 (alarmin1) are molecular markers of ageing and neurological, cardiovascular and immune diseases. Created in St. Petersburg Institute of Bioregulation and Gerontology short peptides are known to regulate gene expression and protein synthesis. They promote the mortality decrease and slowdown the development of pathology in the elderly. The article presents the proposed role of dipeptide vilon (Lys-Glu) and tetrapeptide epitalon (Ala-Glu-Asp-Gly) in CCL11 and HMGB1 genes regulation as activators of their expression. Geroprotective action of vilon and epitalon probably realizes in suppression of these genes.
62. Neuro Endocrinol Lett. 2001 Aug;22(4):251-4. Synthetic tetrapeptide epitalon restores disturbed neuroendocrine regulation in senescent monkeys. Khavinson V(1), Goncharova N, Lapin B. Author information: (1)St. Petersburg Institute of Bioregulation and Gerontology, 3 Dynamo Prospect, 197110 St. Petersburg, Russia. ibg@medport.ru The OBJECTIVE of this research was to investigate the regulatory effect of Epitalon on the production of melatonin and cortisol in senescent monkeys. MATERIAL AND METHODS: We investigated the character of melatonin and cortisol secretion by immunoferment assay in Epitalon-administered female Macaca mulatta in different age periods. RESULTS: Epitalon was proven to significantly stimulate melatonin synthesis in senescent monkeys in the evening, thereby normalising the circadian rhythm of cortisol secretion.
22. Adv Gerontol. 2010;23(4):543-6. [Influence of peptides from pineal gland on thymus function at aging]. [Article in Russian] Lin'kova NS, Poliakova VO, Trofimov AV, Sevost'ianova NN, Kvetnoĭ IM. The interference between thymus and pineal gland during their involution is considered in this review. The research data about influence of thymus peptides on pineal gland and pineal peptides on thymus is summarized. Analysis of these data showed that pineal peptides (epithalamin, epitalon) had more effective geroprotective effect on thymus involution in comparison with geroprotective effect of thymic peptides (thymalin, thymogen) on involution of pineal gland. The key mechanisms of pineal peptides effect on thymus dystrophy is immunoendocrine cooperation, which is realized as transcription's activation of various proteins.
Sources: pubmed.ncbi.nlm.nih.gov
56. Neuro Endocrinol Lett. 2002 Aug;23(4):365-8. Pineal-regulating tetrapeptide epitalon improves eye retina condition in retinitis pigmentosa. Khavinson V(1), Razumovsky M, Trofimova S, Grigorian R, Razumovskaya A. Author information: (1)St. Petersburg Institute of Bioregulation and Gerontology, North-Western Branch of the Russian Academy of Medical Sciences, 3 Dynamo Project, 197110 St. Petersburg, Russia. ibg@medport.ru We have studied the effect of tetrapeptide Epitalon (Ala-Glu-Asp-Gly) on the course of congenital pigmented degeneration of the retina. The application of Epitalon in Campbell rats is found to intensify the bioelectric and functional activity of the retina due to the preservation of its morphological structure. Epitalon therapy in patients with degenerative retinal lesions results in a positive clinical effect in 90% of the cases. The analysis of Epitalon effects suggests that the tetrapeptide participates in the mechanisms of transcription common for the epiphysis and retina.
60. Vopr Onkol. 2001;47(5):601-7. [Effect of vilon and epithalone on induction and growth of induced bladder neoplasms in rats]. [Article in Russian] Pliss GB(1), Mel'nikov AS, Malinin VV, Khavinson VKh. Author information: (1)N.N. Petrov Research Institute of Oncology, Ministry of Health of the RF, St. Petersburg. Experimental data on the effect of peptides--Vilon (Lys-Glu) and Epitalon (Ala-Glu-Asp-Gly)--on induction of urinary bladder tumors in rats are presented. Treatment with Vilon was followed by a significant fall in tumor incidence in 56% of experimental animals, as compared with 75.5% in control, as well as inhibition of early-onset neoplastic changes in the bladder mucosa. No inhibitory effect of Epitalon was recorded.
47. Neuro Endocrinol Lett. 2003 Oct;24(5):329-33. Peptide Epitalon activates chromatin at the old age. Khavinson VKh(1), Lezhava TA, Monaselidze JR, Jokhadze TA, Dvalishvili NA, Bablishvili NK, Trofimova SV. Author information: (1)St Petersburg Institute of Bioregulation and Gerontology of the North-Western Branch of the Russian Academy of Medical Sciences, Russia. khavinson@gerontology.ru OBJECTIVES and design. We have studied the effect of synthetic peptide Epitalon on the activity of ribosomal genes, denaturation parameters of total heterochromatin, polymorphism of structural C-heterochromatin and the variability of facultative heterochromatin in cultured lymphocytes of persons aged 76-80 years. RESULTS: The obtained data demonstrate that Epitalon induces the activation of ribosomal genes, decondensation of pericentromeric structural heterochromatin and the release of genes repressed due to the age-related condensation of euchromatic chromosome regions. CONCLUSIONS: Epitalon has shown its ability to activate chromatin by modifying heterochromatin and heterochromatinized chromosome regions in the cells of older persons.
Sources: pubmed.ncbi.nlm.nih.gov
Vladimir Khavinson and colleagues at research institutes in Saint Petersburg developed and studied the peptide. Their program examined short peptides as regulators of aging and neuroendocrine function. Epitalon was one of several compounds produced by that group.
That question is not settled. Cell culture studies have reported increased telomerase activity after treatment, but comparable evidence from controlled human trials is lacking. Any claim about telomere lengthening in people should be treated as unproven.
It has not completed the large, controlled trials required for drug approval in major jurisdictions. Most human reports involve small samples and limited follow-up. As a result, it is sold as a research chemical rather than a licensed pharmaceutical product.
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.