Melanotan 2 has human research going back over 25 years showing significant increases in sexual desire and erections in men with erectile dysfunction (PMID: 11035391) Melanotan 2 activates melanocortin receptors, while this Melanotan 2: Day 6 , Another one hour in what minimal sun we had today. , No tanning beds, just sun. , Moved down to 50mcg before sun exposure, No more side effects :) , Before & before , Well see Melanotan II vs PT 141: Key Differences in Research PT 141 Superior Peptide