When it comes to herbal supplements, "natural" doesn't necessarily mean "safe."

The government recently banned the dietary supplement ephedra, which had been linked to at least 150 deaths and dozens of heart attacks and strokes. The supplement was popular in weight-loss formulas. But doctors at UT Southwestern Medical Center at Dallas say just because this one potentially dangerous supplement is off the shelves doesn't mean all herbal supplements are safe or effective. Read more