Nearly seven out of 10 Americans take dietary supplements of one kind or another. Most believe they're safe and that they do what it says they do on the label.

These assumptions could be wrong—in some cases, dangerously wrong.

We asked Victor Navarro, MD, medical chair in the Department of Transplantation, and a recent guest speaker at Philadelphia Magazine's Thinkfest, to weigh in on the subject.

1.) A 2015 consumer survey suggests 68 percent of U.S. adults take dietary supplements, and that 84 percent are confident that they’re safe, effective and of high quality. Do you believe their confidence is misplaced?

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