| http://www.w3.org/ns/prov#value | - Overall, the scientific evidence on echinacea for colds ... nccih.nih.gov/health/tips/topsupplements - External Health LinksTime To Talk About Natural Products for the Flu and Colds: What Does the Science Say? (National Center for Complementary and Integrative Health) ... cause digestive disturbances such as diarrhea and nausea.
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