It's main purpose is that it's a natural compound in plants It is used in perfume in cosmetics, and as a food additive. It won't do anything for weight reduction.
I have been using them for several months. For me it helps with fatigue. I think that the intended purpose is appitite control. More than that I also have less carb cravings, things like spinach and other greens taste even better to me and is about all I really want to eat.
Since I have been taking it I have lost about 25 lbs.