Yeah mine is the 2.5%..
Wow the burn of PGE-1 for me really depends on where I inject. Near the base on the right I have way less burn, if I do so most anywhere else it really burns a good deal more. So see what works for you.
But to the business. PGF2a is strange. Its effects last for at least a day and it make you narrow up and get more dense. It constricts, so if you ever go past the 4 hour mark you can use this stuff as it will take away your erection. I mixed mine with Human Relaxin 2, IGF-1 and 2 as well as the Follistatin. It left a strange burn all day and at first kept me from a full erection, but later I was up but could tell it was there still restricting my expansion.