I praised Zantrex-3 for days when I first started taking it, it seemed to give me alot of added energy.  however when I got on a scale it was not reflected there.  You also have to be careful about the dosing of Zantrex-3 the bottle say to take 1- 2 capsules for a significant energy boost, which I don't recommend.  I tried taking 2 at times and they caused extreme nervousness and rapid heartbeat.  They also seemed to give me a mild headeach if I took more than 1 capsule.  I didn't have any real weight loss that i can attribute to taking zantrex but as mentioned before they do seem to be effective...