Americans spend billions of dollars each year on vitamins, minerals, and herbs. Dietary supplements can help with good nutrition. But many people take them without knowing enough to make sure they get the best results. Find out how much you know about dietary supplements by taking this quiz.
The U.S. Pharmacopeial Convention (USP), NSF International, and ConsumerLab approve supplements that have passed tests. These tests are for:
In general, it's best to check with your doctor before taking any supplement. But this is especially true if you have a chronic health problem. If you have any of these conditions, talk with your doctor about taking a B12 or other supplement:
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