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Key terms: echinacea cold study plant species root flower purple medicine leaves products chemical dose symptoms yellow dosage herbal shaped leaf extracts purpurea tribes duration bases hairy genus spiny angustifolia florets pallida phenols common cold murray turner prevention recommended composite throats documented petioles corollas flower head cold symptom asteraceae most species some species inflorescence immune system expressed juice echinacea angustifolia Search external links cited by footnotes on Wikipedia page Echinacea: |
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