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 How Melanotan Peptides Work to Enhance Skin Tone and Promote Tanning Age Well ATL No, you don't need the 'Barbie drug' to tan, whatever TikTok says. Here's why melanotan II is so risky Melanotan Peptides: Science Behind Skin Darkening And Their Biological Mechanisms Age Well ATL