PT 141 Bremelanotide Nasal Spray SweetSpot Labs USA PT 141, scientifically referred to as Bremelanotide, is a synthetic peptide developed through extensive structural modification of the naturally occurring alpha melanocyte stimulating hormone (a MSH). This peptide has gained considerable interest PT 141 Injections vs Nasal Spray: Which is Right for You? Invigor Medical The Best Peptide for Erectile Dysfunction: What PT 141 Offers (and Where It Falls Short)