A visit to the health food store can be an overwhelming experience. It’s tough to figure out what to choose from among the dizzying assortment of dietary and nutritional supplements on the shelf. From vitamins to minerals to weight loss pills, there are thousands of options to choose from.

But do you really need any of them? Do they really work, and if so, which ones are best? WebMD turned to some experts for answers about the multibillion-dollar dietary and nutritional supplement industry.

The Truth Behind the Top 10 Dietary Supplements