Epithalon

Epithalon (Epitalon; CAS 307297-39-8; MW 390.4 g/mol; C14H22N4O9; sequence Ala-Glu-Asp-Gly / AEDG) is a synthetic tetrapeptide modeled after Epithalamin, a naturally occurring polypeptide fraction secreted by the pineal gland's epithalamus region. It was developed and characterized by Professor Vladimir Khavinson and colleagues at the St. Petersburg Institute of Bioregulation and Gerontology over a research program spanning more than four decades.

As a four-amino acid peptide, Epithalon is among the smallest and most chemically stable compounds in the General Peptide catalog. Its minimal molecular footprint belies biological activity extending across cellular, endocrine, and systems-level aging mechanisms.

The primary and best-characterized mechanism is telomerase (hTERT) activation in somatic cells. Telomerase is the ribonucleoprotein enzyme responsible for adding telomeric DNA repeats to chromosome ends — an activity normally silenced in most adult somatic cells, allowing telomere shortening with each cell division. As telomeres erode below a critical threshold, cells enter replicative senescence or apoptosis — a central mechanism of tissue aging. Epithalon documented ability to activate hTERT in somatic cells, elongating telomeres and extending replicative lifespan in cell culture models, has made it one of the most studied tools in telomere biology research.

Beyond telomerase, Epithalon exerts multi-level regulatory effects on the pineal gland: it normalizes melatonin secretion patterns (which decline and dysregulate with aging), restores circadian rhythm entrainment, and modulates FSH and LH gonadotropin levels. Antioxidant activity — both direct and via upregulation of antioxidant enzymes — has been documented across multiple tissues. Khavinson's longitudinal studies showed long-term Epithalon administration in elderly research subject, monkey, and human subjects was associated with significantly extended lifespan, reduced cancer incidence, reduced cardiovascular disease, and improved cognitive function.