i been using that stimulant X...this stuff makes me crazy and i get inmpotence, but it ripped the fat off. i dropped 50 lbs since the last week of Feb 07. I lost some muscle, but most it was because of cardio. I went from 30% bodyfat to my present 15% on it (according to a tanita scale i have). if u can handle the side effects for over a month its worth it. keep in mind tho i did cardio twice a day and only ate fruits and veggies (occasional bowl of oatmeal twice a week when i felt weak), along with my normal protein sources.