Epithalon, also known as Epitalon, is a tetrapeptide composed of the amino acids alanine, glutamic acid, aspartic acid, and glycine (AEDG), originally derived from bovine pineal gland extracts. Researchers primarily study Epithalon for its potential geroprotective and neuroendocrine effects, particularly its role in modulating aging processes and enhancing telomerase activity. Key findings from studies indicate that Epithalon can induce telomerase activity and promote telomere elongation in human somatic cells, as well as decelerate aging and suppress tumor development in transgenic mice. Additionally, preclinical evidence suggests that Epithalon may improve intestinal absorption characteristics in aged rats. Despite the considerable volume of research, the quantity of physico-chemical and structural investigations of this peptide remains limited, highlighting the need for further exploration.