Melanotan 2: Day 6 , Another one hour in what minimal sun we had today. , No tanning beds, just sun. , Moved down to 50mcg before sun exposure, No more side effects :) , Before & before , Well see Nasal Tanning Sprays linked with skin cancer and serious respiratory problems The peptide revolution: inside the injectables industry 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 II: Tanning injections, nasal sprays harmful to health melanotan II C50H69N15O9 CID 92432 PubChem