Fat burner

Speaking of diet, I wonder if those over the counter diet pills that can be found in most stores can really burn fat effectively. Most of them are not FDA approved and I'm a bit of a skeptic. Sure, they promise quick weight loss and I admit I envy the "after" picture they post in their print ads but I'm not sure if they really work or not, or if there's any long term side effects. Should I try or not? It would be nice to lose the pounds, won't it?? But at what price?