Quick Answer
Epitalon is the synthetic tetrapeptide Ala-Glu-Asp-Gly (AEDG), designed by Vladimir Khavinson's group from Epithalamin, a cattle pineal gland extract. Two claims surround it: that it switches on telomerase and lengthens telomeres, and that it restores melatonin output in older animals. The telomere finding has held up in cultured human cells in one independent laboratory, which also saw telomeres lengthen in cancer cells. The animal lifespan gains are modest, the melatonin data conflict, and the human longevity studies used the extract, not Epitalon.
Epitalon is the best known of the Khavinson bioregulators, often called an anti-ageing peptide, and one of the few with any independent laboratory follow-up. This article covers what it is, the proposed mechanisms, what the studies report and in which models, and how much of the longevity story holds up.
What Epitalon is
Epitalon is a tetrapeptide of alanine, glutamic acid, aspartic acid and glycine, written Ala-Glu-Asp-Gly or AEDG (molecular formula C14H22N4O9, molecular weight 390.35 g/mol, CAS 307297-39-8). It is also spelled Epithalon or Epithalone.
It descends from Epithalamin, a complex of peptides extracted from cattle pineal gland, developed at the Kirov Military Medical Academy in Leningrad and registered as a medicine in 1990. To get a defined molecule, the group designed a four-residue sequence from Epithalamin's amino acid composition, synthesised it and patented it in Russia in 2000. Only in 2017 did the group report detecting AEDG itself in the pineal extract, using chromatography and mass spectrometry. The sequence was designed first and found in the extract later.
The proposed mechanisms
Two mechanisms are proposed, and popular accounts often blend them.
- Gene regulation and telomerase: under the general bioregulator hypothesis, a peptide this small enters the nucleus and binds DNA. Fluorescently labelled AEDG has been seen in the nucleus and nucleolus of cultured HeLa cells and, in solution, bound some DNA sequences in preference to others. A 2005 modelling paper predicted a binding site for Epitalon that recurs in the promoter region of the telomerase gene. That prediction links the peptide to its best-known claim: switching on telomerase, the enzyme that rebuilds telomeres, the protective caps on chromosome ends that shorten as cells divide.
- Pineal gland and melatonin: Epitalon is said to restore the pineal gland's night-time melatonin output, which falls with age.
Both rest mainly on the originating group's work, and neither causal chain has been shown step by step in a living animal.
What the studies show
Cell studies: telomerase and telomeres
In 2003 Khavinson's group reported that adding Epitalon to cultured human fetal fibroblasts, which normally lack telomerase activity, induced the telomerase catalytic subunit, telomerase activity and telomere elongation. A 2004 follow-up reported that treated fibroblasts made ten extra divisions beyond the point where untreated cells stopped, and were still dividing: a claim to have passed the so-called Hayflick limit.
The most important later study is independent. In 2025 a Brunel University London team reported that Epitalon lengthened telomeres in normal human fibroblasts and mammary epithelial cells over three weeks, with increased hTERT expression and telomerase activity, broadly in line with the 2003 report. In two breast cancer cell lines telomeres also lengthened, but mainly through ALT (alternative lengthening of telomeres), a telomerase-independent pathway that some cancers use. The authors note that the work was in two-dimensional cell culture and that their PCR-based telomere measurement can overestimate.
Not every result points the same way. In stimulated blood lymphocytes from 11 donors, AEDG lengthened telomeres in five, shortened them in two and made no significant difference in the rest, a pattern the group described as normalisation. Independent groups in China and South Korea have reported less oxidative damage in ageing mouse eggs and better maturation of cow eggs in culture: evidence of activity in vitro, not in whole organisms.
Melatonin: conflicting results
In old rhesus monkeys, Epitalon raised night-time melatonin and lowered basal glucose and insulin, with no effect in young animals. A 2012 study from the group in cultured rat pineal cells reported more AANAT, the key enzyme in melatonin synthesis, and more melatonin in the culture medium. Against this, a 2003 study at the Pitié-Salpêtrière in Paris, co-authored by Khavinson and his collaborator Vladimir Anisimov, found that AEDG had no significant effect on melatonin secretion from isolated rat pineal glands, young or old, at any concentration tested. The melatonin claim is unresolved even in rats.
Animals: lifespan and tumours
The best-known mouse study is less dramatic than its reputation. In female SHR mice treated from three months of age for life, Epitalon did not change mean lifespan, food intake or body weight. It was associated with 13% longer survival in the longest-lived tenth of animals, a 12% higher maximum lifespan, fewer chromosome aberrations and less leukaemia, while total tumour incidence was unchanged. In a separate study in female CBA mice, mean survival rose by 5.3%. Both come from the originating network.
Humans: mostly the extract
The human longevity data usually quoted concern Epithalamin, not Epitalon. The most cited study, by researchers in St Petersburg and Kyiv, followed 266 older people for six to eight years and reported lower mortality with Thymalin, Epithalamin or both than in controls; its abstract does not describe randomisation or blinding. A randomised study of 79 older coronary patients in Kyiv, 39 of them given Epithalamin alongside standard therapy, reported a more normal melatonin rhythm and lower mortality over 15 years of follow-up. Clinical data on synthetic Epitalon itself are limited to a few studies from the originating institute, such as a trial in 162 people with retinitis pigmentosa compared against conventional treatment, with no blinding described.
Reading the longevity claims honestly
The evidence supports a narrower statement than the one usually made.
- Telomeres: Epitalon lengthens telomeres in cultured human cells in two laboratories, one of them independent. Nothing comparable has been shown in living people.
- Telomere length cuts both ways: most cancers maintain their telomeres, through telomerase or ALT, so a compound that lengthened telomeres in cancer cell lines needs careful safety study, even though the originating group's rodent work reports fewer tumours rather than more. An independent 2025 review from the Medical University of Warsaw concluded that toxicity, genotoxicity and carcinogenicity studies are still needed.
- Lifespan: the mouse gains are modest, appear in one strain only among the longest-lived animals, and come from one network.
- Human mortality: the studies used Epithalamin, a different product, and have not been repeated outside the originating network.
- Melatonin: positive in monkeys and cultured cells, negative in isolated rat pineal glands.
A fair summary: Epitalon is biologically active in cell culture, and its telomere effect is one of the very few bioregulator findings to have been reproduced independently. The jump from there to slowing human ageing is not supported by controlled evidence.
Status and where Epitalon fits
Epitalon is not authorised as a medicine in the UK, EU or US and is supplied for laboratory research only. For UK researchers, current availability is on our Epithalon UK page.
Epitalon is often studied alongside the thymus peptides Thymalin and Vilon. For how all the bioregulators fit together, see our guide to the Khavinson bioregulator peptides and the evidence behind them.
References
- Khavinson VKh. (2020). "Peptide medicines: past, present, future." Klinicheskaya Meditsina (in Russian). doi:10.30629/0023-2149-2020-98-3-165-177
- Araj SK, et al. (2025). "Overview of Epitalon-Highly Bioactive Pineal Tetrapeptide with Promising Properties." International Journal of Molecular Sciences. PubMed 40141333
- Khavinson VK, et al. (2017). "Identification of Peptide AEDG in the Polypeptide Complex of the Pineal Gland." Bulletin of Experimental Biology and Medicine. PubMed 29124531
- Fedoreyeva LI, et al. (2011). "Penetration of short fluorescence-labeled peptides into the nucleus in HeLa cells and in vitro specific interaction of the peptides with deoxyribooligonucleotides and DNA." Biochemistry (Moscow). PubMed 22117547
- Khavinson V, et al. (2005). "DNA double-helix binds regulatory peptides similarly to transcription factors." Neuro Endocrinology Letters. PubMed 15990728
- Khavinson VKh, et al. (2003). "Epithalon peptide induces telomerase activity and telomere elongation in human somatic cells." Bulletin of Experimental Biology and Medicine. PubMed 12937682
- Khavinson VKh, et al. (2004). "Peptide promotes overcoming of the division limit in human somatic cell." Bulletin of Experimental Biology and Medicine. PubMed 15455129
- Al-Dulaimi S, et al. (2025). "Epitalon increases telomere length in human cell lines through telomerase upregulation or ALT activity." Biogerontology. PubMed 40908429
- Khavinson VK, et al. (2019). "Effect of Peptide AEDG on Telomere Length and Mitotic Index of PHA-Stimulated Human Blood Lymphocytes." Bulletin of Experimental Biology and Medicine. PubMed 31761987
- Yue X, et al. (2022). "Epitalon protects against post-ovulatory aging-related damage of mouse oocytes in vitro." Aging (Albany NY). PubMed 35413689
- Ullah S, et al. (2025). "Epitalon-activated telomerase enhance bovine oocyte maturation rate and post-thawed embryo development." Life Sciences. PubMed 39788414
- Goncharova ND, et al. (2005). "Pineal peptides restore the age-related disturbances in hormonal functions of the pineal gland and the pancreas." Experimental Gerontology. PubMed 15664732
- Khavinson VKh, et al. (2012). "Molecular cellular mechanisms of peptide regulation of melatonin synthesis in pinealocyte culture." Bulletin of Experimental Biology and Medicine. PubMed 22816096
- Djeridane Y, et al. (2003). "Effect of a synthetic pineal tetrapeptide (Ala-Glu-Asp-Gly) on melatonin secretion by the pineal gland of young and old rats." Journal of Endocrinological Investigation. PubMed 12809170
- Anisimov VN, et al. (2003). "Effect of Epitalon on biomarkers of aging, life span and spontaneous tumor incidence in female Swiss-derived SHR mice." Biogerontology. PubMed 14501183
- Anisimov VN, et al. (2001). "Effect of synthetic thymic and pineal peptides on biomarkers of ageing, survival and spontaneous tumour incidence in female CBA mice." Mechanisms of Ageing and Development. PubMed 11163623
- Khavinson VKh, Morozov VG. (2003). "Peptides of pineal gland and thymus prolong human life." Neuro Endocrinology Letters. PubMed 14523363
- Korkushko OV, et al. (2011). "Peptide geroprotector from the pituitary gland inhibits rapid aging of elderly people: results of 15-year follow-up." Bulletin of Experimental Biology and Medicine (the indexed English title says pituitary; the study concerns the pineal extract Epithalamin). PubMed 22451889
- Khavinson V, et al. (2002). "Pineal-regulating tetrapeptide epitalon improves eye retina condition in retinitis pigmentosa." Neuro Endocrinology Letters. PubMed 12195242