Ok I asked Big A about this , but I want to see if anyone else has had this problem . I am site injecting 1 cc of test suspension with a 1/2 cc of Syntherol into my bi's .I read Big A's list of dos and dont with synth and I following completely . When I inject I aspirate always , and the Synth helps the test susp from clogging big time . But after a few hours I noticed that my bi gets all pink , sore , and hot . Later the same nite I have trouble sleeping cause of the pain (yes I rub the help out of it and do arms right after the shot) , and I develop flu like symptons for the next 2 or 3 days afterwards . Fever , acheness , the works ! I got the Synth from one of the pros at Synthetek , Phil Hernon , and he said he heats up the oil to around 90-95 degrees to thin it out before shooting it . Tried that and same results , the flu ! Any help out the guys .............Thanks