Tiffany,
I've worked in a GNC for about 2 years and the results speak for themselves. The stacker two will actually have more ephedrine, guarana seed extract (caffiene), and more white willow bark extract (salicin, which is in asprin) however, the extra minerials and herbs in hydroxycuts along with the ECA will make it a better weight loss catylast. To tell you the truth, the coustomers in GNC actually prefer Xenadrine to Hydroxycuts because it has herbs in it to produce a calming effect like Taurine, etc. This will really help so you won't get the shakes or other effects that come from increased stimulant intake. So my advice is to go with the Xenadrine. If you have any other specific questions just e mail me. Good luck.
Doctor Matt
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