Epithalon is a synthetic tetrapeptide (Ala-Glu-Asp-Gly) originally derived from the peptide complex epithalamin, isolated from the pineal gland. It is best known for its potential to activate telomerase, an enzyme that lengthens telomeres—the protective caps on chromosomes associated with cellular aging. Research suggests Epithalon may support circadian rhythm regulation, enhance immune function, and promote healthy aging. It has been studied for its geroprotective properties and its role in extending lifespan in animal models.