Melanotan 2 Dosage Calculator and Chart A Z Guide Martina Big Says She's Black From Melanotan II Injections Misinformation 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 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.