Acting FDA chief: Many unanswered questions on CBD

The acting head of the Food and Drug Administration launched the agency's first hearing on cannabidiol products Friday with a laundry of list of questions about the cannabis extract, better known as CBD, that is already being sold in pills, tinctures, skin lotions, sodas and dog food:

How much CBD is safe to consume daily? How will it interact with other drugs? What if a consumer is pregnant? What is CBD's effect on children? What happens if someone takes it over the course of years?

Acting commissioner Norman "Ned" Sharpless, at a jam-packed, all-day hearing at FDA headquarters in Silver Spring, Md., said answers to most of those questions are still unknown despite the popularity of many CBD products...