MELANOTAN II 10 mg Peptide Cart Meet Melanotan II (aka Melanin 2) Peptide Think of this peptide as your sun kissed secret weapon. Melanotan II works by gently stimulating your body's natural melanin productionthe pigment that gives Melanotan II Wikipedia 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