Seven Days Of Melanotan 2 , Only about 4 hours of sun exposure this week. , I feel as though my face has gotten the best results so far. , Hoping the sun actually comes out this week! , Have my 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 longer lasting than Melanotanassociated melanoma Paurobally 2011 British Journal of Dermatology Wiley Online Library Melanotan II (Tan Jabs): Why They're Not Worth The Risk