I just switched sources (the new one is mct based) and mix test and tren a injections have been painful during the injection(burn) and sore (not swollen) for a few days, is it bad gear, the oil, anything else?
Most of the time test 400 will have some kind of pip associated with it because of the high mgs per Cc. Go back to your 250 and you should be fine Especially with mct oil.
Pin each separately and learn which one is giving that burning sensation. Tren shouldn’t hurt at all and I’ve pinned 400 test before with no problems either ..