if you're a newb running 500mg-1g ew, no. have some on hand just in case, but run in throughout? no, that's retarded. will only hurt your gains. unless you're hyper-hyper-sensitive to deveoping gyno or a fag who doesnt want any water retention, it's stupid. adex even at low doses kills too much estrogen, estrogen is not bad.
Arimidex does not kill estrogen, it simply blocks the aromatase enzyme, but not every last bit of it...if you took enough I guess you could suppress all of it, but that would take a lot. Second point, it will not hurt your gains, if anything it will help them. First off, when you become overly bloated, this often leads to a lethargic feeling...that's bad for training. Second, arimidex has been found to help you get more out of your test, making it more, for lack of a better word "potent." Last off, why wait to see if you're going to get gyno? Why not prevent it from the onset?
As far as hindering gains, maybe you're thinking of the old argument against running nolvadex during a cycle...some say this will hinder your progress. I'm not 100% certain of that, but it doesn't matter, because arimidex should be used instead.
