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 What are 'melanotan' injections? Explaining the controversial tanning drug Dazed How Melanotan Peptides Work to Enhance Skin Tone and Promote Tanning Age Well ATL Melanotan Tanning Peptides: Safe Use, Side Effects & How It Works Scientifically