Melanotan 1 (10 MG) Sigma Compounds Melanotan 1 (10 MG) Sigma Compounds 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 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 Melanotan 1 Tanning UK MT1 Afamelanotide Research Peptide