Educational reference. Research use only.
Epithalon: Mechanism, Research, and Regulatory Status
Epithalon is a synthetic tetrapeptide, Ala-Glu-Asp-Gly (AEDG), CAS 307297-39-8, molecular weight 390.35 g/mol, whose sequence was derived from the bovine pineal gland extract Epithalamin. The published evidence summarized for Epithalon is preclinical (human cell cultures and rodent models). Epithalon is not FDA-approved and is supplied for non-human research use only.
Last reviewed 2026-09-29
What is Epithalon?
Epithalon key facts
Epithalon, also spelled Epitalon, is a synthetic tetrapeptide with the sequence Ala-Glu-Asp-Gly, CAS number 307297-39-8 and a molecular weight of 390.35 g/mol. The Epithalon sequence was derived from the amino acid composition of Epithalamin, a bovine pineal gland extract, and the two have largely separate evidence bases. Khavinson and colleagues reported in 2003 that Epithalon induced telomerase activity and telomere elongation in telomerase-negative human fetal fibroblasts, and in 2004 that treated fibroblasts completed about ten passages beyond the control limit. In female SHR mice, Anisimov and colleagues reported in Biogerontology in 2003 no change in mean life span but a 12.3% rise in maximum life span. In HER-2/neu transgenic mice, Anisimov and colleagues reported fewer and smaller mammary tumors in 2002. Djeridane and colleagues found in 2003 that Ala-Glu-Asp-Gly had no significant effect on melatonin secretion by rat pineal glands. Epithalon is not FDA-approved, sits in FDA bulk-substance Category 2, and is supplied for non-human research use only.
How does Epithalon work?
Epithalon is a synthetic tetrapeptide, Ala-Glu-Asp-Gly, whose sequence was derived from the amino acid composition of Epithalamin, a bovine pineal gland extract. Telling the two apart is essential when reading this literature. Epithalamin is a complex peptide extract, whereas Epithalon is a single defined synthetic tetrapeptide, and the two have largely separate evidence bases.
The most-cited proposed mechanism is telomere-related. Telomeres are the protective caps at the ends of chromosomes that shorten as cells divide. Adding Epithalon to telomerase-negative human fetal fibroblast cultures was reported to induce expression of the telomerase catalytic subunit, enzymatic telomerase activity, and telomere elongation.
A follow-up reported that treated fibroblasts underwent approximately ten additional passages beyond the control replicative limit. A 2025 independent study reported dose-dependent telomere elongation in normal epithelial and fibroblast cells via hTERT and telomerase upregulation, and telomere extension in breast cancer cell lines via the Alternative Lengthening of Telomeres pathway, with the ALT contribution largely specific to cancer cells. Note that this paper carries a published correction.
A second proposed mechanism involves direct interaction with nucleic acids. Short regulatory peptides have been reported to bind the DNA double helix and modulate gene transcription, though the structural and biophysical characterization of that interaction remains limited. In rodent models, Epithalon has been reported to reduce chromosome aberration frequency in bone marrow cells and to downregulate HER-2/neu transcript expression in mammary tumors of transgenic mice.
Importantly, the frequently asserted claim that Epithalon restores melatonin secretion is not supported by direct measurement. An independent perifusion study found that Ala-Glu-Asp-Gly had no significant effect on melatonin secretion by pineal glands from either young or old rats, and did not modify stimulated melatonin release. The overall mechanistic picture remains poorly resolved.
What has research on Epithalon found?
What published peer-reviewed research and preclinical studies have established about Epithalon:
- 01In telomerase-negative human fetal fibroblast culture, Epithalon was reported to induce hTERT expression, telomerase enzymatic activity, and telomere elongation (Khavinson 2003).
- 02Treated human fetal pulmonary fibroblasts were reported to complete approximately ten additional passages beyond the control replicative limit (Khavinson 2004).
- 03An independent 2025 study reported dose-dependent telomere elongation in normal human cells via hTERT and telomerase upregulation, and ALT-mediated elongation largely specific to cancer cell lines; a correction to this article was subsequently published (Al-Dulaimi 2025).
- 04In female SHR mice, treatment did NOT influence mean life span; it increased the life span of the last 10% of survivors by 13.3% and maximum life span by 12.3%, and reduced bone marrow chromosome aberrations by 17.1% (Anisimov 2003).
- 05In HER-2/neu transgenic mice, treatment reduced cumulative tumor number and maximum tumor size and was associated with a 3.7-fold reduction in HER-2/neu transcript expression in mammary tumors (Anisimov 2002).
- 06A direct perifusion study by an independent group found Ala-Glu-Asp-Gly had no significant effect on melatonin secretion by rat pineal glands at any age or concentration tested, contradicting a commonly repeated claim (Djeridane 2003).
Frequently asked questions about Epithalon
What is the difference between Epithalon and Epithalamin?+
This distinction is essential when reading the literature. Epithalamin is a complex extract of bovine pineal tissue; Epithalon is a single defined synthetic tetrapeptide (Ala-Glu-Asp-Gly) derived from its amino acid composition. Most of the human observational literature concerns Epithalamin, while the telomerase and cell-culture work concerns Epithalon. Findings from one should not be attributed to the other.
What is the proposed mechanism?+
The most-studied hypothesis is induction of hTERT expression and telomerase activity with consequent telomere elongation, demonstrated in human cell culture. A secondary hypothesis involves direct peptide-DNA interaction modulating gene transcription, though this is not well characterized structurally. Recent review work notes that physicochemical and structural investigation of the peptide remains quite limited.
Does Epithalon affect melatonin?+
This is frequently claimed but is not supported by direct measurement. An independent perifusion study found that Ala-Glu-Asp-Gly produced no significant effect on melatonin secretion by pineal glands from young or old rats across the concentrations tested, and did not alter stimulated release. Melatonin-related claims should be treated as unsupported by the available direct evidence.
Are there human clinical trials?+
No. A ClinicalTrials.gov search returns no registered studies of the synthetic tetrapeptide. Human studies commonly cited in this context used Epithalamin, the bovine pineal extract, and were non-blinded, non-placebo-controlled, unregistered, and conducted by the institutions that developed the preparations.
How should the geroprotection literature be interpreted?+
With considerable caution. The rodent lifespan data are more limited than commonly represented. In the principal SHR mouse study, mean life span was not affected, and the effects were confined to maximum life span and the longest-lived decile. Most in vivo work originates from the institutions that developed the compound, replication outside those groups is sparse, and no registered human trials exist. Claims of anti-aging or life extension in humans are not supported by the published evidence.
What are the handling and stability considerations?+
As a short, highly polar lyophilized tetrapeptide it is hygroscopic; equilibrate to room temperature before opening, and avoid repeated freeze-thaw cycles. Confirm identity and purity by HPLC and mass spectrometry on receipt.
References & sources
Every citation below was resolved against its primary source before publication. Each PMID was checked against its PubMed record and each DOI through doi.org. Follow any link to read the paper at the publisher rather than taking our summary on trust.
- [1]Khavinson VK, Bondarev IE, Butyugov AA. Epithalon peptide induces telomerase activity and telomere elongation in human somatic cells. Bulletin of Experimental Biology and Medicine. 2003. PMID: 12937682 DOI: 10.1023/a:1025493705728
- [2]Khavinson VK, Bondarev IE, Butyugov AA, Smirnova TD. Peptide promotes overcoming of the division limit in human somatic cell. Bulletin of Experimental Biology and Medicine. 2004. PMID: 15455129 DOI: 10.1023/b:bebm.0000038164.49947.8c
- [3]Anisimov VN, Khavinson VK, Popovich IG, et al. Effect of Epitalon on biomarkers of aging, life span and spontaneous tumor incidence in female Swiss-derived SHR mice. Biogerontology. 2003. PMID: 14501183 DOI: 10.1023/a:1025114230714
- [4]Anisimov VN, Khavinson VK, Provinciali M, et al. Inhibitory effect of the peptide epitalon on the development of spontaneous mammary tumors in HER-2/neu transgenic mice. International Journal of Cancer. 2002. PMID: 12209581 DOI: 10.1002/ijc.10570
- [5]Djeridane Y, Khavinson VK, Anisimov VN, Touitou Y. 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. 2003. PMID: 12809170 DOI: 10.1007/BF03345159
Where this data comes from
- Citations & trial data: PubMed (NCBI, U.S. National Library of Medicine), Crossref and ClinicalTrials.gov.
- Chemical identity: PubChem and UniProt. Where sources conflicted, the disputed value is omitted rather than guessed.
- Regulatory status: U.S. FDA publications and, where applicable, the WADA Prohibited List. Compounding status changes often, so check FDA directly before relying on it.
- Purity, form and storage are handling and supplier conventions, not literature-derived values. Confirm against the lot-specific certificate of analysis. General handling is covered in the storage and stability guide.
Content last reviewed 2026-09-29. Compiled by Veridian Research from the primary literature. This page is an educational reference for laboratory researchers. It is not medical advice, and it describes no human use.
Is Epithalon approved for human use?
Epithalon is not approved by the U.S. Food and Drug Administration for any indication and is not authorized for human use in the United States. FDA has placed Epitalon in Category 2 of the bulk drug substances nominated under sections 503A/503B of the FD&C Act, the category for substances that may present significant safety risks. FDA states that compounded drugs containing epitalon may pose immunogenicity risk due to potential aggregation and peptide-related impurities. FDA's Pharmacy Compounding Advisory Committee reviewed Epitalon-related bulk drug substances in July 2026 for possible inclusion on the 503A Bulks List; advisory committee recommendations are non-binding and this status is live and may change, so verify against FDA's current published position rather than any secondary source. Unlike Semax and Selank, Epithalon is not a registered medicine in the Russian Federation; the related pineal extract preparation Epithalamin is a separate product and should not be conflated with the synthetic tetrapeptide. Supplied strictly for in vitro and non-human laboratory research; not for human or veterinary use.
Research-use-only material
Specifications and certificate of analysis
Epithalon is stocked as a research reagent. Analytical documentation, covering identity, purity and the lot-specific certificate of analysis, is published in the certificate library.