Melanotan Tanning Peptides: Safe Use, Side Effects & How It Works Scientifically 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 Melanotan 2 10mg 10mg Peplogix Nasal tanning sprays contain Melanotan II which is banned in the UK and some users have been hospitalised. We would urge residents not to use these products.