I have tried both hydroxy vut and xenadrine. I now take stacker 2, which i think works the best. I have been on it for about 2 weeks and lost 9 pounds. It works so much faster if you cut down you fat intake though. But, I received a free sample of stacker 3 which has a fat blocker in it. So, if you plan on eating fat I would suggest this one because this one also work for me.