Echinacea, ephedra, evening primrose oil...garlic, ginger, ginseng...St. John's wort, selenium, shark cartilage -- these are just a few of the natural medicines that millions of people are using. But do they work? Medical authorities often argue against them; alternative medicine advocates tout them. What's a consumer to do, while waiting for modern science to catch up with often ancient practices? Help is here, with The American Pharmaceutical...