Historical perspectives on the use of herbal preparations to promote health.

Herbal products continue to be popular among the American public for the treatment or prevention of a number of ailments. The medicinal use of herbs is deeply rooted in human history and folklore, and has been incorporated into the traditional medicine of virtually all human cultures. Strong religious and mystical beliefs have been associated with the healing properties of many herbs. These beliefs, together with the definite physiological and pharmacological effects of various herbs, as well as their economic potential, have been instrumental in the development of human medicine. Despite advances in our understanding of the medicinal and toxic properties of many herbs, the consumer today is confronted with misinformation concerning the efficacy of herbs that rivals the heyday of the patent medicine era. The discussion that follows examines the development of certain concepts throughout history concerning the use of herbs, and how these concepts may help account for the continued popularity of two highly promoted herbs, ginseng and garlic.