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 You Should Avoid Using Nasal Tanning Sprays Melanotan 2 Nasal Spray Polar Peptides Nasal tanning spray warning We've become aware of widespread availability of nasal sprays containing Melanotan II, mostly on line, but also through gyms and salons. The sprays are promoted as a safe way