There's a dizzying array of vitamins, herbs, and minerals available to treat almost any health problem. On today's Please Explain feature, we’ll ask the experts which supplements really help, and which ones don't. We’ll hear from Dr. David Talmage, Director of the Masters of Science in Human Nutrition Program and the Post-Doctoral Training in Human Nutrition at the Institute for Human Nutrition at Columbia University, and Dr. Wahida Karmally, Director of Nutrition in The Irving Center for Clinical Research and Associate Research Scientist and Lecturer in Dentistry at Columbia University Medical Center.

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