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 Reminder of serious health risks with 'Melanotan 2' self tan products Irish Pharmacist 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 I C78H111N21O19 CID 16164658 PubChem Melanotan II: Natural Tanning, Hormone Balance & Vitality Boston Health Longevity Viral tanning 'Barbie drug' linked to cancer, experts warn