I think it all depends on the person. I took Xen and Metabolife. . .alternating between the two. The key to these pills are to drink LOTS OF WATER. Usually when you're on caffeine pills and you start to shake, that means you arent drinking enough water to counteract the drug. And you're not supposed to exercise heavily with these pills. That's how come so many people end up dying. There's ephedrine to speed up the metabolism for you. So, take a quick but not fast-paced hour walk and eat right.
I lost 15 pds last summer. So, it really was a great booster for me. Of course, I couldn't afford the pills so I'm back to exercising and eatting one time a day.
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