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 for energy boosters. almost comparable to the effedrine that many people couldn't take or didn't like the effects of. Another effect of taking zantrex-3 for me was if I took them too late in the evening they kept me up all night. Ingredients for weight control consist of of yerba mate, guarana and damiana. Energy control components are xanthines. Zantrex-3 is produced by Zoller Industries.