Its basically just a caffeine pill, but a very high dose one. I didn't like it because it seems like it would mess with my digestive system and give me a bit of the runs. I only took it like 3 times so I'm not positive it was the zantrax, but I am pretty sure it was. When I worked at GNC people returned it saying it was too much for a lot of them. For 40 bucks a bottle or whatever get yourself some caffeine pills. If its for weight loss make your own ECA stack.
