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 MT 2 (Melanotan II) Polar Peptides Unlocking the science behind skin pigmentation Melanotan is a peptide studied for its interaction with melanin pathways the biological systems responsible for skin tone and UV response. From pigmentation signaling