PT-141 is also known as Bremelanotide and is most known for its ability to treat sexual dysfunction in men and women. It is a derivative of Melanotan 2. It’s a synthetic peptide blend, as it isn’t naturally produced in the body like growth hormones are. PT 141 was developed from the Melanotan 2 hormone which is known to help darken pigmentation of the skin. It has often been linked to individuals treating sexual disorders (including ED or hypoactive sexual desire in women).