PT 141 is a peptide that works through signaling pathways in the brain related to arousal and desire. Unlike therapies that focus directly on hormone levels, PT 141 is often discussed for how it Double blind, placebo controlled evaluation of the safety, pharmacokinetic properties and pharmacodynamic effects of intranasal PT 141, a melanocortin receptor agonist, in healthy males and patients with mild to moderate erectile dysfunction PT 141 (Bremelanotide) 10MG Raw Amino PT 141 10mg OP Labs (Formerly Oxford Peptides) PT 141 Nasal Spray vs Injection: Key Differences Explained