Herbal supplements are generally defined as those dietary supplements that are obtained from naturally growing plants, fungus, shrubs and trees. There are a wide variety of such supplements on the market today, such as Ginkgo Biloba, the much touted memory enhancement supplement; St. John's Wart, a supplement often prescribed for cases of mild depression and anxiety; and the ever popular Echinacea, a mid-western wildflower best known for its ability to boost the immune system. Because herbal supplements ...