From the Manufacturer:
Echinacea, commonly known as purple cornflower, has been in use medicinally for centuries. Archaeological finds have uncovered Native American Indian usage for over 400 years. Echinacea is most often used to fight infections and boost the immune system. The production of interferon increases in the body with the use of Echinacea. It has been shown to be beneficial in wound healing, treating boils, treating urinary infections and reducing fever.
Echinacea has demonstrated great benefit in the treatment of upper respiratory tract infections. Numerous studies have examined the use of Echinacea for preventing and treating the common cold. Most found that taking Echinacea at the first signs of a cold for 8 to 10 days reduced cold symptoms or shortened their duration by as much as 34%.