Natural products have provided the primary sources for new drug development. Chemicals known to have medicinal benefits are considered to be “active ingredients” or “active principles” of natural medicines. In the USA, approximately 49% of the population has tried natural medicines for the prevention and treatment of diseases. Today, natural medicines not only provide the primary health-care needs for the majority of the population in developing countries but have attracted more and more attention in developed countries due to soaring health-care costs and universal financial austerity. Natural medicines, such as traditional Chinese medicine (TCM) and Ayurveda, were formed and developed in the daily life of ancient people and in the process of their fight against diseases over thousands of years, and they have produced a positive impact on the progress of human civilization.
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