Melanotan II is a synthetic peptide studied for its role in melanin production and skin pigmentation It works by mimicking alpha MSH which is the hormone involved in regulating skin color Primary Melanotan 2 Reviews, Clinical Trials, and Safety Melanotan II 10mg Prime Lab Peptides Not the same from a safety standpoint. Unless youre trying to get tanned (please dont use a tanning bed), PT141 is always going to be the answer.