Q&A: Should you trust trending peptide injections? The Dangers of Melanot*n II Explained Sharing my personal experience with Melanotan tanning injections (now nasals) how vanity led me down the path of using it, thinking Id done all my research. Now, years later, Im dealing with the 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