PT 141 Melanotan II: Tanning injections, nasal sprays harmful to health Melanotan I 10 MG 99% Purity NuScience Peptides Glastonbury PT141 Bremelanotide Peptide Therapy 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 PT 141 Bremelanotide Troche Brain Pathway Sexual Health AgeMD