PT-141 peptide bodybuilding overview PT-141, also known as Bremelanotide, is a peptide that is being researched for its potential benefits in bodybuilding and fitness. PT-141 is a synthetic version of a hormone that is naturally produced in the body known as melanocyte-stimulating hormone (MSH). One of the key benefits of PT-141 is that it acts as an aphrodisiac, increasing sexual desire …