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 You Should Avoid Using Nasal Tanning Sprays Targeting the central melanocortin system for the treatment of metabolic disorders Nature Reviews Endocrinology Melanotan Tanning Injections The Low Down Lynton Lasers Melanotan Erectile Dysfunction: What the Early Research Shows and Practical Considerations What exactly is Melanotan and how does the tanning solution work?