MELANOTAN 1 Crescent Chems Research When it comes to tanning peptides, there are two main options: Melanotan 1 and Melanotan 2. Melanotan 1, also called afamelanotide, is FDA approved for a rare light sensitivity condition and works Comparing Melanotan 1 and Melanotan 2 Peptides Core Peptides Your body already makes a hormone that tells your skin to tan. Melanotan 2 is a synthetic peptide engineered to mimic that hormone but in a version that's more potent and