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Key terms: active angustifolia asteraceae chemical cold common cold concluded documented dosage dr duration echinacea echinacea angustifolia echinacea paradoxa effects expressed juice extracts herbal immune system journal levels medicine murray native pallida phenols plant prevention products purple coneflower purpurea recommended review root species spiny study symptoms taken treatment tribes turner yellow Search external links cited by footnotes on Wikipedia page Echinacea: |
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