Some Traditional Herbal Medicines, Some Mycotoxins, Naphthalene, and Styrene : World Health Organization : 9789283212829 : 9283212827 : 01 Jan 2002 : Traditional herbal medicines encompass an extremely diverse group of preparations that originate from many different cultures. In recent years, such products have become widely available commercially in developed countries where mixtures prepared from medicinal plants have been marketed or uses that were never contemplated in the traditional healing systems from which they emerged. In many countries, herbal medicines are not subject to rigorous standards with respect to manufacturing efficacy, quality and safety. For example, herbal remedies containing plant species of the genus Aristolochia and used in Europe for body weight loss have caused kidney disease and urothelial cancers and are now classified as carcinogenic to humans. This monograph evaluates the carcinogenic risks to humans posed by the use of some traditional herbal medicin