Epithalon is a synthetic tetrapeptide based on the pineal gland's natural epithalamin. It is a pioneering compound in longevity research, primarily studied for its potential to activate the enzyme telomerase, which is involved in maintaining telomere length—a key marker of cellular aging. Beyond telomere support, research explores its antioxidant properties and potential to support pineal gland function, which regulates circadian rhythms. Epithalon represents a cutting-edge avenue for investigating cellular health, antioxidant defense, and the fundamental biology of aging.