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 Dr Amy Perkins Dermatology Have you heard of peptides? Did you know they can cause all sorts of problems, including with your skin? I spoke with STV and Scotland Instagram Melatonin 2 Tan Before and After TikTok PDF) Increasing illegal use of Melanotan: The Barbie drug hype Background