Epithalon Tetra Peptide is a peptide used to regulate the cell cycle through up-regulation of telomerase activity. Telomerase is a specific RNA-dependent polymerase that elongates and maintains the length of telomeres by adding tandem repeats on the chromosomal 3' end. The research and studies done concerning telomerase show that telomerase activity is limited to cell division through its action of stabilizing the telomere length.