Epithalon (also transliterated as Epitalon) is a synthetic tetrapeptide with the sequence Ala-Glu-Asp-Gly, first developed and studied by Vladimir Khavinson and colleagues at the St. Petersburg Institute of Bioregulation and Gerontology. It is a synthetic analogue of Epithalamin — a natural polypeptide extract derived from the pineal gland — and belongs to the Khavinson peptide bioregulator class: short peptides theorized to carry tissue-specific gene regulatory signals. Among all compounds in this research program, Epithalon has accumulated the largest published literature, centered on telomerase activation, telomere elongation, neuroendocrine regulation, and aging biology.
For researchers investigating the biology of cellular aging, telomere dynamics, pineal gland function, or the mechanistic basis of peptide bioregulator activity, Epithalon represents the most extensively studied compound in its class and a unique tool for examining telomere-targeting approaches to cellular longevity research.
Epithalon is a tetrapeptide (four amino acids: Ala-Glu-Asp-Gly) with a molecular weight of 390.35 g/mol. As the shortest synthetic member of the Khavinson bioregulator series, it is structurally simple and chemically stable. The tetrapeptide sequence was derived through systematic fractionation of pineal gland extract (Epithalamin) to identify the minimum active sequence responsible for the natural extract’s biological effects — a research strategy that has been applied to multiple organ-derived tissue extracts to produce the broader Khavinson peptide library.
Epithalon is supplied as a white lyophilized powder, is water-soluble, and reconstitutes readily in bacteriostatic water. Its small molecular size makes it exceptionally stable relative to larger research peptides and tolerant of a wider range of storage and handling conditions. The compound is used in both in vitro cell culture research and in vivo animal studies.
| Property | Value |
|---|---|
| Full name | Epithalon (Ala-Glu-Asp-Gly) |
| Also known as | Epitalon, Epitalone, tetrapeptide AEDG |
| Amino acid sequence | Ala-Glu-Asp-Gly |
| Molecular formula | C₁₄H₂₂N₄O₉ |
| Molecular weight | 390.35 g/mol |
| CAS number | 307297-39-8 |
| Purity (Official Peptides) | >99% by HPLC |
| Physical form | White lyophilized powder |
| Solubility | Water soluble |
| Storage (lyophilized) | 2–8°C, protected from light |
| Storage (reconstituted) | 4°C, use within 30 days |
The most prominently documented molecular effect of Epithalon in preclinical research is its ability to activate telomerase — the ribonucleoprotein enzyme responsible for maintaining telomere length by adding TTAGGG repeat sequences to chromosome ends during cell division. Telomere shortening with each cell division is a fundamental mechanism of replicative senescence, and telomerase activity in somatic cells is generally insufficient to prevent progressive telomere attrition over a lifetime.
Research by Khavinson and colleagues, published in peer-reviewed journals including the Bulletin of Experimental Biology and Medicine, has reported that Epithalon treatment activates telomerase in human fetal fibroblast cell cultures and peripheral blood lymphocytes, producing measurable telomere elongation in treated cells compared to untreated controls. Studies have documented TERT (telomerase reverse transcriptase) upregulation at the mRNA level in Epithalon-treated cultures, suggesting transcriptional activation of the telomerase catalytic subunit as a mechanism.
The significance of these findings in the context of aging biology is substantial: telomere length is considered one of the most reliable biomarkers of biological age at the cellular level, and the ability of a small tetrapeptide to activate telomerase and drive measurable telomere elongation represents a distinctive and pharmacologically unusual mechanism. Independent replication of these findings in Western research institutions would significantly strengthen the evidence base; this remains an area where additional corroborating research is needed.
As a synthetic analogue of pineal gland-derived Epithalamin, Epithalon has been studied for its effects on neuroendocrine function — particularly on melatonin and cortisol secretion patterns, which are regulated in part by pineal gland activity. Research in aged animal models has examined whether Epithalon administration can restore circadian melatonin rhythmicity that becomes disrupted with advancing age.
Studies in aged rats have reported Epithalon-associated normalization of melatonin secretion amplitude — specifically, restoration of the nocturnal melatonin peak that attenuates in older animals. Research has also documented effects on cortisol rhythmicity and on gonadotropin secretion patterns in aged animals, consistent with a modulatory role on hypothalamic-pituitary-gonadal axis function. These neuroendocrine effects are considered relevant to the broader aging phenotype studied in Khavinson bioregulator research.
Oxidative stress is a central driver of cellular and molecular aging, and research has examined Epithalon’s effects on antioxidant defense mechanisms in aged animals and cell models. Studies have reported upregulation of antioxidant enzyme activity — including superoxide dismutase and catalase — in Epithalon-treated tissues, alongside reductions in lipid peroxidation markers. These antioxidant effects are proposed to contribute to Epithalon’s observed effects on cellular longevity independently of its telomerase-activating activity.
Animal longevity studies conducted by Khavinson’s group have examined whether long-term Epithalon administration affects lifespan in rodent models. Published reports have described modest lifespan extension in Epithalon-treated groups compared to controls, alongside reduced incidence of age-related pathological changes including tumors and degenerative organ changes. These longevity data, while intriguing, are from a limited number of studies and require independent replication before firm conclusions can be drawn.
The immune system undergoes progressive deterioration with age — a process termed immunosenescence — that is associated with thymic involution, reduced T-cell diversity, and impaired immune responses. Research has examined Epithalon’s effects on immune function in aged animal models, reporting improvements in T-lymphocyte activity and natural killer cell function in treated groups. Some studies have examined Epithalon in combination with Thymalin (a thymic bioregulator from the same research program) for additive effects on immune restoration in aged models.
The relationship between telomerase activation and cancer biology presents an important dual consideration in Epithalon research. Telomerase is overexpressed in the large majority of human cancers — where it maintains telomere length and enables replicative immortality — making its activation a potential concern in proliferating cell populations. Research has examined this question in the context of Epithalon, with studies in cancer-prone mouse strains and carcinogen-challenged models reporting reduced tumor incidence in Epithalon-treated groups compared to controls.
Researchers interpret this paradox through the concept of selective telomerase activity in normal versus transformed cells: in normal somatic cells with intact tumor suppressor function, telomerase activation may enable healthy proliferation without promoting transformation, while the tumor-suppressive effects of restored genomic stability may counteract oncogenic pressures. This remains an actively debated area in telomere biology and should be carefully considered in research designs using Epithalon in cell proliferation models.
Telomeres are repetitive DNA sequences (TTAGGG in humans) capping the ends of chromosomes, bound and protected by the shelterin protein complex. With each cell division in the absence of telomerase, 50–200 base pairs are lost from the telomere — eventually reaching a critical minimum length that triggers DNA damage signaling and replicative senescence or apoptosis. Telomerase — composed of the catalytic TERT subunit and the RNA template TERC — counteracts this attrition by extending telomeres after replication.
In human somatic cells, telomerase expression is suppressed to prevent the replicative immortality associated with malignant transformation. This creates the aging paradox: the same mechanism that protects against cancer (telomere shortening → senescence → tumor suppression) also drives the accumulation of senescent cells that contributes to tissue aging, chronic inflammation, and organ dysfunction. Research tools that can selectively modulate telomere length in specific cell populations without driving malignant transformation are therefore of significant scientific interest — placing Epithalon’s reported telomerase-activating activity in an important research context.
Exceptional stability for a peptide: Epithalon’s tetrapeptide structure, absence of oxidation-prone residues, and high water solubility make it more stable than most research peptides. Lyophilized Epithalon stored at 2–8°C remains stable for 3+ years. Reconstituted solutions are stable at 4°C for up to 30 days with minimal degradation under standard laboratory conditions.
Research literature context: The majority of published Epithalon research originates from Khavinson’s laboratory and Russian research institutions. While a growing number of independent studies have examined Epithalon’s biological activities, researchers should critically evaluate the evidence base and seek independent corroboration for key findings before using published data to anchor quantitative research designs.
Cell proliferation monitoring: Research designs using Epithalon in dividing cell populations should include appropriate monitoring of cell cycle parameters and viability markers alongside telomerase activity measurements, given the complex relationship between telomerase activation and cell proliferation biology.
Official Peptides supplies research-grade Epithalon at >99% purity verified by HPLC and mass spectrometry. Each batch is accompanied by a certificate of analysis from an independent third-party laboratory. Epithalon ships cold-pack from our US facility and is available in 10mg vials to support extended research protocols.
Order Epithalon from Official Peptides →
Official Peptides supplies research-grade Epithalon with >99% HPLC purity and batch-specific COA included. US domestic shipping 2–5 business days. For in vitro research use only.
All content is provided for research reference purposes only. For in vitro laboratory research use only.