Multivitamins. Herbal remedies. A tablespoon of cod liver oil. Surveys suggest that more than half of all Americans probably took a supplement in some form in the past 30 days, all in the name of improving their health. The global supplement market is estimated to be more than $65 billion and as much as $200 billion, according to industry reports. But how effective are all those pills, powders, and tinctures at doing everything they claim to do: brighten the skin, heal the gut, or fight insomnia? Can you separate the good from the bad from the useless? Take our quiz to find out how much you really know about supplements, and learn a bit along the way, too.
