Cortagen is a synthetic tetrapeptide with the amino acid sequence Ala-Glu-Asp-Pro (AEDP). It belongs to the family of “Khavinson peptides,” which are short bioregulatory peptides typically composed of 2 to 4 amino acids. These peptides are known for their ability to influence gene expression in a tissue-specific manner and have been studied for their potential therapeutic effects on aging, inflammation, and tissue repair.