I used them when they had ephedra in them and lost 35 pounds from 200 to 165 relatively quickly but it was a "false" loss in my opinion because it only sped up my metabolism while I was taking them and I ate horribly. This time around I use only food an exercise and have lost at about the same rate. 30 pounds in 20 weeks. I think that it should be a no-no for anyone who wants to keep the weight off. I quit them and slowly put a pound a month back on for 3 years! Not good for the heart with the epehedra either! Good luck!