During cold season, people often search for natural cold remedies and immunity boosters. Echinacea has long been rumored to both prevent and knock out colds. But the evidence in favor of the herbal supplement is mixed, and its varied preparations make it hard to study.
The name “echinacea” refers to almost 10 species of flowering herb, and echinacea supplements use one or several of these species. They can be made using either the plant’s above-ground parts or its below-ground roots (or both). All this variance has led to disagreement among experts when it comes to echinacea’s benefits.
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“Our study found no evidence for an effect of echinacea on common cold illnesses,” says Dr.