Melanotan II: Tanning, Sexual Health Benefits, & Safety Concerns L Carnitine Paste (CP+) Greyhound Products Direct 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 A Current Affair: Tanning 'Barbie drug' a danger to users, experts say Figure 4 from Changes of melanocytic lesions inducedby Melanotan injections and sun bed use ina teenage patient with FAMMM syndrome Semantic Scholar