I used to work at GNC and we sold them. It's an OTC thermogenic. It will say it "works when combined with diet and exercise." Well, so does everything else! So, long story short, no, it will not cause weight loss. I am not even sure that it would increase weight loss. The only OTC weight loss drug that works is the only one that's approved by the FDA - Alli. That's because it's also a prescription weight loss drug (xenical/orlistat), but in a reduced amount.
Sorry to disappoint, but I'd recommend you don't waste your money.