Archaeological evidence indicates that the use of medicinal plants dates back to the Paleolithic age, approximately 60,000 years ago. Written evidence of herbal remedies dates back over 5,000 years to the Sumerians,

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The World Health Organization(WHO) estimates that 80 percent of the population of some Asian and African countries presently use

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Paraherbalism is the pseudoscientific use of extracts of plant or animal origin as supposed medicines or health-promoting agents. Phytotherapy differs from plant-derived medicines in standard pharmacology because it does not isolate and

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Herbalists tend to use extracts from parts of plants, such as the roots or leaves, believing that plants are subject to environmental pressures and therefore develop resistance to threats such as radiation, reactive oxygen speciesand microbial attack to

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Indigenous healers often claim to have learned by observing that sick animals change their food preferences to nibble at bitter herbs they would

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• Ayurveda
• Chinese herbology
• Ethnobotany

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Africa
Up to 80% of the population in Africa uses traditional medicine as primary health care.
Americas
Native Americans used about 2,500 of the approximately 20,000

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