Everyone is doing peptides. But not all peptides work the same way. Some fire up libido, others sharpen memory each one targets specific receptors and pathways to drive precise biological responses. 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 Nasal Spray vs Injection: Which Is More Effective? PT 141 10mg Cellpept Research