It has caffeine in it, which will speed up your metabolism a little. Other ingredients make claims that sound very dubious to me. What they did was, they found a few studies that showed a slight weight loss benefit in mice or test tubes or something, then stuffed all the ingredients in a pill
Most of the so-called impartial customer reviews I found on a quick Google search are obvious company propaganda, and the maker has a rating of F with the Better Business Bureau.
I would suggest coffee instead. If you make it at home, it's a lot cheaper. And you don't have to give your credit card info to scammers.