PT-141 (Bremelanotide) is a synthetic cyclic heptapeptide analog of α-MSH (melanocyte-stimulating hormone) that functions as a potent agonist at melanocortin receptors MC3R and MC4R. This first-in-class melanocortin agonist demonstrates unique central nervous system-mediated effects on sexual arousal and desire through direct action on brain centers involved in sexual response. Our research-grade PT-141 enables investigation into neuroendocrine pathways of sexual function, melanocortin receptor pharmacology, and novel approaches to sexual dysfunction research.