Dietary supplement makers offer a dizzying array of products to improve your health: Ginkgo biloba to boost memory, St. John’s wort to relieve depression, vitamin C for the common cold, and glucosamine and chondroitin to ease arthritis—among many, many others. In 2015 alone, Americans spent more than $35 billion on dietary supplements.

But supplement manufacturers don’t have to prove to the Food and Drug Administration that their products are effective or even safe before putting them on the market.

So as part of our ongoing coverage of supplements, Consumer Reports is reviewing the research and talking with medical experts to find out whether common supplements live up to their marketing hype and whether they are safe to take.

New articles in this series will be posted on this hub page, so be sure to check back periodically for the latest facts and information.

You can also download this PDF to get a list of the studies we relied on for the article “Strong, Happy, and Healthy” from the September 2016 issue of Consumer Reports magazine.