Echinacea/Glodenseal increases the non-specific activity of the immune system. In other words, unlike a vaccine which is active only against a specific disease, echinacea estimulantes the overall activity of the cell responsible for fighting all kinds of infection. Unlike antibiotics, which are directly lethal to bacteria, Echinacea makes our own immune cells more efficient in attacking bacteria and viruses. When combined together, echinacea and goldenseal are powerful herbs that help to support a healthy immune system. It's best to start taking this combination as a prophylactic before the cold and flu season begins.