I don't know shit about these.. I thought they were just a fat burning agent and I decided to look and see if there were any logs on BB.com ... supposedly there is a great risk of your thyroid shutting down (or getting fucked up in some way) after taking these and you need to do PCT? I got an entire box of these for free when I was at the Arnold and I'm in the middle of a cut right now. Can someone explain to me what these things are all about? Worth taking? Side effects, etc.. Thanks.