God no it's NOT safe! It's a drug usually given to horses!
Go and have a look at these links before you consider it -
http://www.personalpowertraining.net/Art...
http://www.articleonramp.com/Article.cfm...

it is a medicine for astma patients. opens blood vessels and air vessels and makes heart pump faster. that fastens metabolism. u might try if u re lazy. people say it helps to lose weight. i personally prefer to do it the hard way - by exercising

no its not safe,guys use it before going to the gym.i tried it once and i was sick and couldnt stop shaking! dont bother.try chinese tea,tastes vile but worked for me!