Melanotan II (MT II) Peptide Therapy Beverly Hills 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 Emerging Threat: Melanotan, Repackaging, and Online Sales FDA Fast Facts 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 Tanning Peptides: Safe Use, Side Effects & How It Works Scientifically