Melanotan II Safety: Tanning Injection LIVV Natural Dangerous 'Barbie drug' Melanotan II sparks crackdown on social media influencers ABC News 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 Been testing out MT 1 peptide (Melanotan I) lately and honestly this stuff works. Originally developed for skin protection and UV resistance, but most people know it now for boosting melanin and giving Melanotan II vs PT 141: Key Differences in Research Benefits of Melanotan II (MT 2) Honest Peptide