Yep, and all the health clubs would be shut down, and my certification as a personal trainer would be completely useless.
Save your money and potentially, your health. Those supplements are not regulated by the FDA - what is in the bottle doesn't have to be on the label, and vice versa (supplements are not technically classified as either a food or a drug). In addition, when customers complain of negative side effects of any kind, the makers are not required to report them. That is one of the reasons it took so long to ban ephedra, even after healthy people who followed the directions had strokes, heart attacks, and even died. Think about that.