Research Use Only: This product is supplied for laboratory research and in-vitro studies. Not for human or veterinary administration.
Epithalon (Epitalon)
- Pineal Tetrapeptide: 4-amino acid sequence (AEDG), ≥99% purity, naturally occurring compound
- Telomerase Activation: hTERT upregulation, telomere elongation, dual pathway mechanism
- Geroprotective Research: Pineal melatonin biosynthesis, circadian rhythm regulation, antioxidant defense
- Mechanistic pathway studies
- In vitro receptor profiling
- HPLC verified identity and purity
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Research Overview
Epitalon (Epithalon) is a synthetic tetrapeptide comprising four amino acid residues (Ala-Glu-Asp-Gly) originally synthesized in the 1980s by Professor Vladimir Khavinson at the St. Petersburg Institute of Bioregulation and Gerontology. In 2017, the peptide was detected for the first time in physiological pineal gland extract using liquid chromatography-mass spectrometry (LC-MS), confirming its status as a naturally occurring endogenous compound. Over more than four decades of research, Epitalon has accumulated a substantial body of peer-reviewed literature spanning telomerase biology, chronobiology, neuroendocrine regulation, reproductive aging, ophthalmic science, immunomodulation, and gerontology.
A comprehensive review published in the International Journal of Molecular Sciences in 2025 catalogued the breadth of Epitalon research, characterizing the peptide as possessing \"significant geroprotective and neuroendocrine effects\" arising from antioxidant, neuroprotective, and antimutagenic mechanisms (Araj et al., 2025). The peptide's primary research interest centers on its capacity to activate telomerase through upregulation of the human telomerase reverse transcriptase (hTERT) catalytic subunit, its modulation of pineal melatonin biosynthesis, its anti-inflammatory properties in monocyte/macrophage cell lines, and its antioxidant capabilities that in some experimental models exceed those of melatonin itself.
The peptide demonstrates dual pathways for telomere elongation: a telomerase-dependent pathway in normal cells requiring 3-week incubation, and an Alternative Lengthening of Telomeres (ALT) pathway in cancer cells producing significant telomere extension within 4 days. Recent quantitative evidence by Al-dulaimi et al. (2025) showed 12-fold hTERT upregulation in 21NT cancer cells and dose-dependent telomere length extension in normal cells. The majority of preclinical and clinical studies have been conducted by Khavinson's group in Russia, though the 2025 study by Al-dulaimi et al. represents the first independent confirmation of Epitalon's telomerase-activating and telomere-elongating properties in human cell lines. No registered human clinical trials appear in the ClinicalTrials.gov database, and the compound remains investigational without regulatory approval.
Primary Research Applications
Mechanism of Action
Telomerase Activation and hTERT Gene Expression
hTERT Upregulation — Epitalon activates telomerase enzyme activity through upregulation of the human telomerase reverse transcriptase (hTERT) catalytic subunit. Treatment of breast cancer cell lines 21NT and BT474 and normal epithelial (HMEC) and fibroblast (IBR.3) cells with epitalon at concentrations of 0.1-1.0 μg/mL produced 12-fold hTERT upregulation in 21NT cells at 1 μg/mL and 5-fold upregulation in BT474 cells at 0.5 μg/mL. Dose-dependent telomere length extension in normal cells followed 3-week exposure. The mechanism involves direct interaction with promoter regions of the telomerase gene, where the peptide binds specific DNA sequences including ATTTC motifs (Al-dulaimi et al., 2025).
Telomere Elongation via Dual Pathways
Telomerase-Dependent and ALT Pathways — In normal healthy mammalian cells, epitalon extends telomere length through upregulation of hTERT mRNA expression and telomerase enzyme activity, requiring a 3-week incubation period. In cancer cells, significant telomere length extension occurs through Alternative Lengthening of Telomeres (ALT) activation within only 4 days, with a ten-fold increase in ALT activity in 21NT cells and three-fold increase in BT474 cells. In 21NT cells, telomeres extended from 2.4 kb to 4 kb, while BT474 cells reached up to 8 kb maximum length. Cancer cells may be more susceptible to ALT activation due to reduced levels of histone H1 compared to normal cells (Al-dulaimi et al., 2025).
Pineal Melatonin Biosynthesis Enhancement
AANAT and pCREB Stimulation — Epitalon demonstrates significant regulatory effects on pineal gland function through enhancement of the melatonin biosynthetic pathway. In rat pinealocyte cultures, Epithalone stimulated arylalkylamine-N-acetyltransferase (AANAT) and phosphorylated cAMP response element-binding protein (pCREB) synthesis, resulting in increased melatonin levels in culture medium. In aged non-human primates, Epitalon administration caused a significant increase in basal nighttime melatonin levels, a decrease in basal glucose and insulin levels, and an increase in glucose disappearance rate. These effects were observed only in aged monkeys (20-27 years) and not in younger animals (6-8 years), suggesting the peptide specifically addresses age-related dysfunction rather than producing supraphysiological effects (Goncharova et al., 2005; Khavinson et al., 2012).
Epigenetic Chromatin Modulation
Histone-Peptide Interactions — Epitalon functions as a precision gene-expression modulator through interaction with histone proteins and chromatin structure. The AEDG peptide preferentially binds histone H1/6 (binding energy: -64.51 kcal/mol) and H1/3 (binding energy: -56.49 kcal/mol) at specific DNA-interacting sites, serving as a mechanism for increasing transcription probability of target genes. In human gingival mesenchymal stem cells, AEDG peptide treatment increased expression of neuronal differentiation markers (Nestin, GAP43, beta-Tubulin III, and Doublecortin) by 1.6-1.8 fold. Epitalon also induces decondensation of heterochromatin near centromeres in cultured lymphocytes from elderly individuals aged 76-80 years, potentially restoring gene expression patterns in aged cells where heterochromatin condensation limits gene accessibility (Khavinson et al., 2020).
Antioxidant and Anti-inflammatory Mechanisms
ROS Scavenging and Cytokine Modulation — Epitalon exhibits antioxidant properties through both direct ROS scavenging and upregulation of endogenous antioxidant enzyme systems, with capabilities that in some experimental models exceed those of melatonin. In diabetic retinopathy models, Epitalon at 40-60 ng/mL significantly reduced high glucose-induced hydrogen peroxide generation (P<0.05 to P<0.01) and restored expression of antioxidant genes including SOD2, CAT, and HMOX1 (Gatta et al., 2025). In human monocytic THP-1 cells differentiated into macrophages, Epitalon at 100 ng/mL reduced LPS-stimulated TNF-alpha, IL-6, and IL-17 expression, increased ERK1/2 phosphorylation, and activated STAT1 phosphorylation without triggering IFN-alpha production, functioning as a natural inducer of TNF tolerance in monocytes (Avolio et al., 2022).
“Mechanistic summaries on this page are provided for laboratory reference and should be interpreted within controlled experimental settings only.”
Preclinical Research Summary
In telomere biology studies, treatment of breast cancer cell lines 21NT and BT474 and normal epithelial (HMEC) and fibroblast (IBR.3) cells with epitalon at 0.1-1.0 μg/mL produced 12-fold hTERT upregulation in 21NT cells at 1 μg/mL and 5-fold upregulation in BT474 cells at 0.5 μg/mL, with dose-dependent telomere length extension in normal cells following 3-week exposure. Cancer cells demonstrated a ten-fold increase in Alternative Lengthening of Telomeres (ALT) activity in 21NT cells within 4 days, with telomeres extending from 2.4 kb to 4 kb in 21NT cells and up to 8 kb in BT474 cells (Al-dulaimi et al., 2025). This represents the first independent confirmation of Epitalon's telomerase-activating properties outside of the Khavinson research group.
In reproductive biology models, Epitalon at 0.1 mM reduced intracellular ROS in mouse oocytes from 32.8 ± 5.8 to 4.4 ± 1.0 (P<0.001), a 7.5-fold reduction. Early apoptosis decreased from 39.56% to 26.23% (P<0.001), mitochondrial DNA copy number increased from 95,328 to 127,318, and membrane potential was preserved. Normal spindle rate improved from 48% to 69% (P=0.016) in aged oocytes (Yue et al., 2022). In bovine oocyte cryopreservation studies, Epitalon significantly improved post-thaw blastocyst hatching rate and implantation potential, with telomerase activity significantly compromised in post-thawed embryos and rescued by Epitalon treatment (Ullah et al., 2025).
In ophthalmic models, Epitalon at 40-60 ng/mL restored wound healing in high glucose-injured ARPE-19 human retinal pigment epithelial cells, significantly reduced hydrogen peroxide generation (P<0.05 at 40 ng/mL; P<0.01 at 60 ng/mL), inhibited epithelial-mesenchymal transition markers (SNAIL-1, ZEB-1, TWIST1), and restored antioxidant gene expression (SOD2, CAT, HMOX1) in a diabetic retinopathy model (Gatta et al., 2025). In lifespan extension studies, Epitalon increased Drosophila melanogaster lifespan by 11-16% in both sexes at concentrations 16,000-80,000,000 times lower than effective melatonin concentrations (Khavinson et al., 2000). It is important to note that the majority of preclinical studies have been conducted by the Khavinson group in Russia with limited independent replication, and no registered human clinical trials exist in the ClinicalTrials.gov database.
Academic References
- Araj SK et al. (2025). Overview of Epitalon--Highly Bioactive Pineal Tetrapeptide with Promising Properties. International Journal of Molecular Sciences.
- Al-dulaimi S et al. (2025). Epitalon increases telomere length in human cell lines through telomerase upregulation or ALT activity. Biogerontology.
- Khavinson VKh et al. (2003). Epithalon peptide induces telomerase activity and telomere elongation in human somatic cells. Bulletin of Experimental Biology and Medicine.
- Yue X et al. (2022). Epitalon protects against post-ovulatory aging-related damage of mouse oocytes in vitro. Aging.
- Ullah S et al. (2025). Epitalon-activated telomerase enhance bovine oocyte maturation rate and post-thawed embryo development. Life Sciences.
- Gatta M et al. (2025). The antioxidant tetrapeptide Epitalon enhances delayed wound healing in diabetic retinopathy. Stem Cell Reviews and Reports.
- Avolio F et al. (2022). Peptides Regulating Proliferative Activity and Inflammatory Pathways in the Monocyte/Macrophage THP-1 Cell Line. International Journal of Molecular Sciences.
- Khavinson VKh et al. (2020). Peptide regulation of gene expression. Molecules.
- Korkushko OV et al. (2004). Pineal gland peptide preparation Epithalamin increases the lifespan of fruit flies and mice. Bulletin of Experimental Biology and Medicine.
- Khavinson VK et al. (2000). Effect of epitalon on the lifespan increase in Drosophila melanogaster. Mechanisms of Ageing and Development.
This product is intended exclusively for in vitro laboratory research by qualified professionals. Not for human consumption. Not approved by the FDA.
Published Research Briefs
Our research team has published evidence-checked briefs covering the science behind this compound. Each brief reviews primary sources and grades claims independently.