That seems to be such an individual thing . I'm not sure why . Some guys seem to have hardly any sides others it's a ride from hell . I tend to feel you get better size results when running alot of test with it . BUT I can't stand tren unless I run a low dose of test like hrt . Still however you use tren with training intense and a clean diet with plenty of protien you will ALWAYS get great results ! Tren is the BOMB !!!