Insights into Tanning Biology and Tanning Products JCAD The Journal of Clinical and Aesthetic Dermatology 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 Melanotan is not a tan. It's an unregulated peptide with real risk. As a dermatologist, here's the reality: It has been linked to new and changing moles including cases of October 2017 VOL. 14, ED 3. by PeningtonInstitute Issuu