For weeks into cycle and I switched the test E I was using to a different source. A few days after first shot I was down for a day or two. Horrible pain in injection site and body in weaken state. After that passed the next three weeks of shots no problem. Switched gear for week 5 and boom, a few days later after the first shot from the new gear same thing happened. Can switching gear cause this. Obviously it did but I didn't think there would be a problem since my test levels were already up from the first few weeks of TW other test