Epitalon

What it is

Epitalon (Ala-Glu-Asp-Gly) is a synthetic tetrapeptide derived from the amino acid composition of Epithalamin, a bovine pineal gland extract, and subsequently identified within the pineal gland polypeptide complex itself (PMID 29124531; PMID 40141333). Its proposed mechanisms of action include: (1) Telomerase activation and telomere elongation — Epitalon induces expression of the telomerase catalytic subunit (hTERT), increases telomerase enzyme activity, and extends telomere length in normal human somatic cells and cancer cell lines; in cancer cells, Alternative Lengthening of Telomeres (ALT) activation also contributes (PMID 40908429; PMID 12937682; PMID 15455129). (2) Epigenetic/chromatin remodeling — Epitalon binds preferentially to histone H1/3 and H1/6 and interacts specifically with DNA at CNG and CAG nucleotide sequences, potentially regulating gene transcription via an epigenetic mechanism; it induces deheterochromatinization (decondensation) of heterochromatin in lymphocytes from aged individuals (PMID 32019204; PMID 22117547; PMID 14647006; PMID 24323970; PMID 27259496; PMID 37042594). (3) Melatonin synthesis regulation — Epitalon stimulates arylalkylamine-N-acetyltransferase (AANAT) and pCREB synthesis in pinealocyte culture, increasing melatonin levels; in elderly humans and old monkeys, it restores nocturnal melatonin secretion and circadian rhythm amplitude (PMID 22816096; PMID 17969590; PMID 23289226). (4) Antioxidant effects — Epitalon possesses antioxidant properties, modulates reactive oxygen species (ROS), stimulates antioxidant enzymes (SOD, glutathione peroxidase), and reduces lipid peroxidation products; these effects may exceed those of melatonin in some contexts (PMID 17317455; PMID 60; PMID 18546826; PMID 38). (5) Immune modulation — Epitalon modulates interleukin-2 mRNA levels, influences mitogenic activity of thymocytes, and affects lymphocyte proliferation and cytokine expression (PMID 40141333; PMID 15289226; PMID 35408963; PMID 7). (6) Anti-senescence — Epitalon targets the SUV39H1 axis to partially eliminate therapy-induced senescent cells in NKTCL models. (7) Neurogenic differentiation — Epitalon increases expression of neurogenic differentiation markers (Nestin, GAP43, β-Tubulin III, Doublecortin) in human gingival mesenchymal stem cells. (8) Neuroendocrine effects — Intranasal administration increases cortical neuron discharge frequency in rats. The precise primary receptor or molecular target remains uncertain.

Class: Synthetic tetrapeptide / pineal gland peptide bioregulator

What it's studied for

• Telomere elongation and anti-aging / geroprotection Mixed
  • Dose-dependent telomere length extension in normal human epithelial and fibroblast cells via hTERT upregulation and telomerase activation; cancer cell lines also showed telomere extension via ALT activation. PMID 40908429 Al-Dulaimi et al., Biogerontology (2025)
  • Addition of Epithalon to telomerase-negative human fetal fibroblast culture induced expression of telomerase catalytic subunit, enzymatic activity, and telomere elongation. PMID 12937682 Khavinson et al., Bulletin of Experimental Biology and Medicine (2003)
  • Epithalon added to aging human fetal lung fibroblasts induced telomere elongation and allowed 10 extra population doublings beyond the Hayflick limit (44 vs. 34 passages in control). PMID 15455129 Khavinson et al., Bulletin of Experimental Biology and Medicine (2004)
  • Review concludes Epitalon has significant geroprotective and neuroendocrine effects originating from antioxidant, neuroprotective, and antimutagenic mechanisms, including demonstrated telomerase activation. PMID 40141333 Araj et al., International Journal of Molecular Sciences (2025)
  • Review notes Epitalon as a telomere biology peptide with promising preclinical and limited clinical evidence; states non-approved peptides lack long-term safety data and systematic validation. PMID 35408963 Mavrych et al., Frontiers in Aging (2026)
• Melatonin secretion restoration and circadian rhythm normalization in aging Mixed
  • Epitalon and Epithalamin recovered nocturnal melatonin release and normalized circadian rhythm in elderly humans and old monkeys; in elderly people with pineal insufficiency, increased night melatonin levels were reported with no side effects noted. PMID 17969590 Korkushko et al., Advances in Gerontology (2007)
  • Epithalone stimulated AANAT and pCREB synthesis and increased melatonin levels in rat pinealocyte culture; norepinephrine co-addition potentiated these effects. PMID 22816096 Khavinson et al., Bulletin of Experimental Biology and Medicine (2012)
  • Review reports Epitalon restores circadian rhythms of melatonin and cortisol production in old rhesus monkeys. PMID 12374906 Khavinson, Neuro Endocrinology Letters (2002)
• Anticarcinogenic / cancer prevention effects Animal studies only
  • Epitalon (Ala-Glu-Asp-Gly) is a potent inhibitor of mammary carcinogenesis in rodents and might be useful for breast cancer prevention in women at risk. PMID 12791421 Anisimov, Critical Reviews in Oncology/Hematology (2003)
  • Subcutaneous injection of epithalone (0.1 µg/rat, 5×/week from age 4 months until death) significantly inhibited spontaneous tumors (primarily testicular leydigomas and leukemias) in male rats under various lighting regimens. PMID 19110597 Vinogradova et al., Bulletin of Experimental Biology and Medicine (2008)
  • 35-year research review on peptide bioregulators including Epitalon for cancer prevention (no abstract text available). PMID 19670728 Anisimov & Khavinson, Voprosy Onkologii (2009)
• Retinal protection / retinitis pigmentosa Mixed
  • Epitalon therapy in patients with degenerative retinal lesions resulted in a positive clinical effect in 90% of cases; also intensified bioelectric and functional activity of the retina in Campbell rats. PMID 12195242 Khavinson et al., Neuro Endocrinology Letters (2002)
  • Retinoprotective effect observed in Campbell rats — retinal morphological structure and functional activity preserved approximately 2× longer in treated vs. control animals. PMID 12910293 Khavinson et al., Bulletin of Experimental Biology and Medicine (2003)
  • Epithalon (at certain concentrations) tissue-specifically stimulated proliferation of retinal and pigmented epithelial cells in culture. PMID 12937684 Khavinson et al., Bulletin of Experimental Biology and Medicine (2003)
• Diabetic retinopathy — wound healing improvement In vitro only
  • Epitalon restored impaired wound healing in high-glucose-injured ARPE-19 retinal pigment epithelial cells by inhibiting hyperglycemia-induced EMT and fibrosis; authors note more mechanistic investigations and safety data are needed. PMID 40493162 Gatta et al., Stem Cell Reviews and Reports (2025)
• Chromatin remodeling and epigenetic regulation in aged cells Human observational
  • Epitalon induced deheterochromatinization of total heterochromatin, activated ribosomal genes, and released genes repressed by age-related heterochromatinization in cultured lymphocytes from individuals aged 75–88 years. PMID 16705247 Lezhava et al., Georgian Medical News (2006)
  • Epitalon induced activation of ribosomal genes, decondensation of pericentromeric structural heterochromatin, and release of repressed genes in cultured lymphocytes of persons aged 76–80 years. PMID 14647006 Khavinson et al., Neuro Endocrinology Letters (2003)
  • AEDG peptide increased neurogenic differentiation markers and mRNA expression by 1.6–1.8× in human gingival mesenchymal stem cells; molecular modelling showed preferential binding to H1/6 and H1/3 histones at DNA-interacting sites. PMID 32019204 Khavinson et al., Molecules (2020)
• Anti-inflammatory and immune modulation In vitro only
  • Epitalon (among five Khavinson peptides) modulated proliferative kinase signaling, inhibited TNF and IL-6 expression in LPS-stimulated THP-1 macrophages, and reduced cell adhesion to activated endothelial cells. PMID 35408963 Avolio et al., International Journal of Molecular Sciences (2022)
  • AEDG peptide can activate lymphocyte proliferation in thymus during aging and activate interferon-gamma production in T-cells; a complementary nucleotide sequence to AEDG was found in the IFN-γ gene promoter region. PMID 23289226 Lin'kova et al., Advances in Gerontology (2012)
• Oocyte quality and embryo development improvement Animal studies only
  • Epitalon treatment significantly improved bovine oocyte maturation rate, blastocyst hatching rate, and post-thawed embryo implantation potential; enhanced quality markers of oocytes, cumulus cells, and blastocysts. PMID 39788414 Ullah et al., Life Sciences (2025)
  • 0.1 mM Epitalon reduced intracellular ROS, decreased spindle defects and abnormal cortical granule distribution, increased mitochondrial membrane potential and mitochondrial DNA copy number, and decreased apoptosis in post-ovulatory aging mouse oocytes in vitro. PMID 35413689 Yue et al., Aging (2022)
• Geroprotection / longevity in animal models Animal studies only
  • Subcutaneous epithalone (0.1 µg/rat, 5×/week from age 4 months) significantly normalized population aging rate and time of mortality rate doubling in male rats under natural or constant illumination; did not significantly change mean lifespan. PMID 19110597 Vinogradova et al., Bulletin of Experimental Biology and Medicine (2008)
  • Review reports Epitalon increases lifespan in mice and fruit flies in experimental models. PMID 12374906 Khavinson, Neuro Endocrinology Letters (2002)
• Senolytic activity / chemoresistance reversal in lymphoma Animal studies only
  • Targeting the IQGAP2/LaminA/C/SUV39H1 axis with Epitalon and Chaetocin can partially eliminate therapy-induced senescent cells in NKTCL in vivo models, enhance response to chemotherapeutics, and alleviate the immunosuppressive microenvironment. PMID 42209466 Zhang et al., Cell Death & Disease (2026)
• Antioxidant effects Animal studies only
  • Epitalon and Epithalamin possess antioxidant properties exceeding melatonin in some cases; stimulate SOD, ceruloplasmin and other antioxidant enzymes in old rats; likely act via stimulation of antioxidant enzyme expression and possible metal chelation (Fe2+). PMID 17317455 Kozina et al., Archives of Gerontology and Geriatrics (2007)
  • Injections of epithalon to rats decreased LPO products and reduced oxidative protein modification in serum and cerebral cortex. PMID 18239817 Kozina, Bulletin of Experimental Biology and Medicine (2007)
• Hypothalamic-reproductive axis protection / estrous cycle regulation Animal studies only
  • Epitalon (Ala-Glu-Asp-Gly) corrected diurnal dynamics of dopamine in median eminence-arcuate nuclei disturbed by neurotoxic xenobiotic (DMH) in female rats; shown to be protective against premature reproductive aging. PMID 23237594 Arutjunyan et al., Current Aging Science (2012)
  • Administration of melatonin and epitalon corrected impairments of the hypothalamic-pituitary-gonadal axis in female rats exposed to permanent artificial lighting and DMH. PMID 28976150 Korenevsky et al., Advances in Gerontology (2013)
• Thyroid gland function modulation Animal studies only
  • Administration of Ala-Glu-Asp-Gly to hypophysectomized young chickens and old hens for 40 days significantly reduced hormonal and structural changes in the thyroid gland. PMID 22268052 Kuznik et al., Bulletin of Experimental Biology and Medicine (2011)
  • Epitalon smoothed seasonal variations in thyroid hormones and delayed age-related hormone level changes in rats under various lighting regimens. PMID 20405731 Vinogradova, Advances in Gerontology (2009)
• Renoprotection in rhabdomyolysis Animal studies only
  • Epitalon exerted renoprotective effects against rhabdomyolysis-induced kidney injury in mice by impacting tubular cell toxicity, oxidative stress, and energy imbalance mechanisms. PMID 25730989 Zamorskiy & Shchudrova, Biofizika (2014)
• Neuronal activity modulation (intranasal route) Animal studies only
  • Intranasal administration of epitalon (30 ng/animal) to urethane-anesthetized male Wistar rats increased spontaneous cortical neuron discharge frequency 2–2.5-fold within minutes; effect was multiphasic in some experiments. PMID 17955380 Sibarov et al., Neuroscience and Behavioral Physiology (2007)
• Tuberculosis genome stability / chromosome aberration reduction Human observational
  • Epitalon showed a pronounced protective effect on chromosome aberrations in pulmonary tuberculosis patients (before and after treatment), reducing frequency of aberrant cells; high chromosome fragility persisted with treatment in both pre- and post-treatment conditions. PMID 24323970 Dzhokhadze et al., Georgian Medical News (2013)

Community-reported dosing

Tier key: Research = PMID-cited study · [C] = scraped community source · [S] = model-synthesized from aggregate community reports (softer evidence). How we source.

Safety signals

• Epitalon has been identified in illegal pharmaceutical preparations with assumed cancer, anti-aging, and retinitis pigmentosa indications, highlighting risks of unregulated supply and uncertain purity. PMID 12535022
• One 2026 review classified Epitalon as a 'non-approved peptide' lacking long-term safety data and systematic validation, in contrast to FDA-approved peptide agents. PMID 35408963
• A 2007 study reported that epitalon injection decreased antioxidant activity in rat serum and cerebral cortex while reducing LPO products, suggesting complex modulation of the redox system that warrants further characterization. PMID 18239817
• In vitro data suggest Epitalon can extend telomere length in cancer cell lines (via ALT activation), raising a theoretical question about effects in oncological contexts that requires further study. PMID 40908429
• Correction notice published for the 2025 telomere study, indicating the original findings may require interpretive caution pending clarification of the correction. PMID 41240216

Contraindications

• No explicit contraindications are stated in the reviewed abstracts. The reviewed literature does not identify any population for whom Epitalon is formally contraindicated. PMID 40141333