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 There are two peptides people talk about for tanning: Melanotan 1 and Melanotan 2. Melanotan 1 works slower and mainly targets the skin, leading to a more gradual and even increase in pigment with MT2 (Melanotan 2 Acetate) 10mg Cellpept Research