Ok here is the deal, I'm currently using Test E, EQ and Deca, the problem I have is my first 2 bottles of Test E was another brand and all was well, now I continued with a different brand made Test E and the injection start to hurt like a B!TCH. I've hit arteries before, but with this Test E, everytime I inject it, I feel like I hit an artery. plus my shoulder is so swollen with a bit of black and blue, it leaves me to believe that I have an infection...bad batch i suspect. My question is, I have about 8 bottles of prop which i'm willing to substitute for the Test E.. any difference other than the ester? and what about milligrams?? expert advice please.