Echinacea is one of the most common traditional herbs from the American continent. Originally a Native American medicinal plant, archeologists discovered some evidence that echinacea may have been used by ancient cultures to treat infections and boost immunity. Today, many people use echinacea to treat the common cold and reduce symptoms such as sore throats, coughs, and even fever. Many herbalists also recommend echinacea to help the body fight infections. It is most commonly consumed as a tea, and the loose leaves are available from most health food stores.