Introduction and help needed

[Certified]

Hello everyone, I am entirely new to this. I just restarted my test journey after a few years. Years ago I first started with ultima 400 enanthate from naps and yes I had pretty rough pip but that wasnt too much of a worry. But now I a couple days ago started test from a chinese source that is on here that ill refrain from naming. But i had such a severe allergic reaction to it. Im not sure what from but I was unable to breathe at random times following the first injection, no real injection site redness or swelling, pip yes but nothing major, idk if its something that shouldnt have been in it but obviously I cannot use that source anymore. So i’ve been doing more research on here about what could cause it and im hearing high bb or eo is my most likely answer. So im really looking for a source thats probably domestic usa and i wont have any issues with solvents or anything like that. thank you!