Echinacea evaluated for URIs
Echinacea is a plant native to the United States and Southern Canada. Echinacea purpurea is the most potent and commonly used form of the plant, although other forms have also been studied. Products from this plant have been used historically to treat infections, insect bites, and allergies.
Studies evaluating the effectiveness of Echinacea for upper respiratory infections have been inconclusive. However, the National Center for Complementary and Alternative Medicine is currently supporting a research trial evaluating the effectiveness of Echinacea in the treatment of upper respiratory infections (URIs). The dose of Echinacea tablets is 2 tablets (containing 6.78 mg crude herb) three times daily for the duration of symptoms. Side effects from Echinacea are uncommon; however, upset stomach and nausea have been reported. Allergic reactions to Echinacea are rare, but have been reported. People who are allergic to ragweed, chrysanthemums, marigolds, and daisies should not take Echinacea due to a high risk of allergy.