Epitalon (AGAG) is a tetrapeptide, that consists of amino acids and has a chemical structure Ala-Glu-Asp-Gly. Epitalon activates enzyme telomerase, which leads to telomere elongation. Geroprotective effect of Epitalon is provided by its ability to stimulate melatonin production. Melatonin is a natural antioxidant. Besides, Epitalon increases sensitivity of the hypothalamic-pituitary system to hormones and raises the activity of telomerase. It is effective in treating ovaries imparements