Before you jump on the peptide train, here's the quick rundown: what they are, why they're trending, and where the risks may lie. Head to our link in bio for the Melanotan 2: Day 6 Another one hour in what minimal sun we had today. No tanning beds, just sun. Moved down to 50mcg before sun exposure No more side effects :) Before 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 2 Vials: Premium Tanning Peptide for Glow