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The use of herbal medicines has evolved in various cultures around the world over many millennia. In many developing Asian and African countries, the use of herbal medicines, as supplied by traditional medicinal practitioners, has always been popular Although modern medicines are available in developing countries, herbal medicines have often maintained their popularity for historical and cultural reasons. Concurrently, in the last two to three decades, many people in developed countries have begun to turn to alternative or complementary therapies, including the use of herbal medicines, nutraceuticals, functional foods and other supplements. This resurgence in interest in plant-derived medicines is partly due to the growing dissatisfaction with allopathic medicines, the perception that such medicines are natural and therefore pure and without side-effects, the progress in production of higher quality herbal medicines, and in some cases proven clinical efficacy and safety.