It won't do much for fat loss, as this is basically a naturally occurring stimulant (it contains caffeine), so it will be rather useless. Besides, it is always a bad idea to lose weight with the use of stimulants - they cause side effects, their results are not long lasting, and over time your body will grow tolerant to them. Besides, stimulants can increase your cortisol levels, which in turn decrease muscle mass due to the fact that his is a catabolic hormone.
If you want something truly effective for fat loss, Cardarine GW or SR9009 would be a much better choice. They will effectively burn fat and improve your athletic performance, which will allow to lose even more weight. The best part about them is that they are non-hormonal and they are not stims. So there will be no side effects to be concerned about.