Yep, what these guys said ---> Pt-141, or melanotan (which contains Pt-141 but also has super tanning effects). I use melanotan and that shit is the real deal for erection effects!!!
I take 30 mg Tadalafil, PLUS 1.5 mg melanotan together --- and take them about 2 to 4 hours before go time, and it's on! I am still trying to work out the timing a little, as last weekend I took it about 4 hours before go time, and 2 hours after dosage I was walking around the kitchen with a rock hard cock that I could have hung pots and pans from, and I wasn't even trying to be erect (wasn't rubbing on the old lady, wasn't looking at anything that should have triggered it, no stimuli at all).
Ramp up with your Pt-141 dosage though - it def can and does cause nausea for many, just like
@ironwill1951 said!