Tanning from the inside out = Highly Dangerous and Illegal!, Many products advertised on social media platforms promising a tan from the inside out or a tan without sun such as injectable Melanotan 2 Vials: Premium Tanning Peptide for Glow Who's tan is reay for summer. This peptide can help. 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 II A Sun Kissed Look, and a Confident You.