Melanotan 2 10mg Velora Research PT 141 Research Peptide Alpha Carbon Labs How PT 141 Works Part 2: Onset, Duration & Safety, PT 141 (Bremelanotide) is a melanocortin receptor agonist that targets the central nervous system, enhancing sexual desire and arousal without Melanotan II Skin Pigmentation & Libido 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