Epitalon is a synthetic tetrapeptide with the sequence Ala-Glu-Asp-Gly (often written AEDG). It carries CAS number 307297-39-8 and the molecular formula C14H22N4O9. The compound also goes by Epithalon and Epithalone, and it belongs to a family of short "peptide bioregulators" developed in Russia.
Its origin is specific. In the late 20th century, Vladimir Khavinson and Vladimir Anisimov at the St. Petersburg Institute of Bioregulation and Gerontology worked with epithalamin, an extract of the bovine pineal gland. Epitalon was synthesized as a short peptide based on the amino acid makeup of that extract. A 2017 mass-spectrometry analysis reported finding the AEDG sequence in human pineal tissue. Most of the published work traces back to Khavinson's group and collaborators, which matters when you weigh the evidence.
What it is proposed to do
Two mechanisms come up most often, and both are mostly preclinical.
The first is telomerase. In cell-culture work, Epitalon has been reported to switch on telomerase activity and lengthen telomeres in human somatic cells. A 2003 study in human fetal fibroblasts described increased expression of the telomerase catalytic subunit (hTERT) and cells that continued dividing past the point where untreated cultures normally stop (the Hayflick limit). A more recent paper again reported telomere lengthening in human cell lines. These are in vitro findings in cultured cells, not demonstrations of an effect in people.
The second is the pineal gland and melatonin. Because the peptide was derived from a pineal extract, much of the research looks at melatonin rhythms and neuroendocrine signaling. Animal and cell studies describe effects on melatonin-related enzymes and on the expression of antioxidant genes. Results have been mixed: one study in rats found no significant effect of the tetrapeptide on melatonin secretion at the concentrations tested, while other reports describe restored melatonin patterns in older animals.
Review authors are blunt about the gaps. A 2025 overview of the peptide states that "the precise mechanism of action of this tetrapeptide remains unverified" and notes that safety information is largely missing, calling for toxicity studies.
State of the evidence
The bulk of Epitalon research is preclinical: cell cultures, fruit flies, rodents, and some primate work, much of it reporting geroprotective or antioxidant effects. Human data exist but are limited. Reported clinical work includes trials in older adults and in patients with retinitis pigmentosa, plus cohort studies describing lower mortality over long follow-up periods. The recurring caveat is that these results come largely from a single research group and have not been widely replicated by independent labs. Wikipedia's own entry flags the topic for leaning on primary sources and for fringe-theory concerns.
So the honest summary: interesting laboratory signals around telomerase and the pineal axis, thin and largely unreplicated human evidence, and no established mechanism.
Regulatory and quality notes
Epitalon is not an approved drug in the United States, the EU, or other major markets. There is no FDA or EMA approval, and published safety documentation is sparse. Material sold under the Epitalon or Epithalon name is research-use-only and is not intended for human consumption.
Because it is sold as a research chemical rather than a regulated medicine, what is actually in a vial is not guaranteed by any health authority. For anyone evaluating a supplier, the relevant questions are the same as for any research peptide: a recent third-party certificate of analysis (COA), identity and purity testing by an independent lab (typically HPLC for purity and mass spectrometry to confirm the AEDG sequence), and consistency across batches. peptideone aggregates third-party rater data and published COAs to make that comparison easier; we do not test products ourselves.
Nothing here is medical or dosing advice. This is a neutral summary of what the public record documents.
Sources
- Overview of Epitalon — Highly Bioactive Pineal Tetrapeptide with Promising Properties (review, PMC)
- Effect of a synthetic pineal tetrapeptide (Ala-Glu-Asp-Gly) on melatonin secretion (PubMed)
- Epitalon increases telomere length in human cell lines through telomerase upregulation or ALT activity (PMC)
- Epitalon — Wikipedia (with sourcing/fringe-theory flags)