Don't use that shit !!!!
THe ephedra version could kill you, that's why it's illegal, the non-ephedra version will fuck up with your hormones, all it does is increase your heart beat and your hahahaha temperature so that your metabolism rises.
If you want to lose weight, you need to eat better and a little less, watch your fat and carb intake and excersise as much as possible but at least 15 minutes a day, wlaking fast is a good excersise if you do not have the time to go to a gym.
There is no miracle pill to lose weight
