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(ĕk´´ nā´shē)
, popular herbal remedy, or botanical, believed to benefit the immune system. It is used especially to alleviate common colds and the flu, but several controlled studies using it as a cold medicine have failed to find any benefit from its use. Echinacea is extracted from the roots and flowering tops of the purple coneflower (Echinacea angustifolia and E. purpurea).
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