Many weight loss and immune system supplements are illegally labeled and lack scientific evidence to back up their health claims. The dietary supplement industry is big business—and the US Department of Health and Human Services found that the labeling of 20 percent of the 127 weight loss and immune boosting supplements purchased online and in various stores was deceptive and false.

It’s not just about wasting one’s money on products that don’t work, but more about endangering one’s health when replacing medical treatment with a supplement that may have no effect.