Homeopathy: Founded in the 19th century, a practice that is based on the concept that disease can be treated with minute doses of drugs thought capable of producing in healthy people the same symptoms as those of the disease being treated. This principle is similar to the concept behind exposure therapy for allergies, but the amounts of active medication used in homeopathy are so small as to be almost undetectable. Scientific studies of homeopathy have returned mixed results. It is considered alternative medicine in the US.
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