5 Risky Herbal Supplements: St. John's Wort, Kava, Comfrey, Chaparral, and Pennyroyal

WebMD talks to experts about the potential risks of five herbal supplements: St. John's wort, kava, comfrey, chaparral, and pennyroyal. Original - http://www.m.webmd.com/a-to-z-guides/features/risky-herbal-supplements?src=RS...