yeah they are called clenbuterol and cytomel(t3). they use them in conjuunction with gh, test, insulin, and diuretics... from what i have been told it works pretty well with strict diet+cardio+weight lifting. but i have heard that some pro's actually do use hydroxycut hardcore during pre-contest...which to me just seems unfair, regardless of how unhealthy that must be for the pro's who decide to utilize the extreme thermogenic activity brought on by hydroxycut hardcores active ingredients. fucking muscletech shit is legit bro...
Whatever credibility you had left just went down the drain. You are the exact prey that M.Tech goes after!! Don't believe 6 pg. ads that lie to you with no scientific support to back their claims. M.Tech = underdosed and over priced!
On another note, PM me which pro told you their pre-contest supps. You do not have a clue.
So, to answer the original post, yes, some use thermos some do not. As for the before and afters, you can do wonders by sticking out your gut, slouching, no tan, frowning..
They are hired to sell their products but hard to tell which actually use the products they endorse. They might use a rival product because it works better for them...