What is all the BS about shut down. If your going to use steroids and use them correctly, your getting shut down. Read about negative feed back loops. Also Worm, once you've surpassed your natty genetic potential, there are no such things as permanent gains. Permanent steroid gains are a myth. You never ever see 300 pound pros retain their juiced up physiques when they get off of the juice. Kevin Levrone who I have the utmost respect for, is visual proof of this. Kevin has been training his ass off as a natty recently and is making nice gains(muscle memory), but will not get to the freaky size and conditioning he used to achieve with out some kind of enhancement.