Echinacea: Cure for the Common Cold

Conclusion
From the studies and research summarized here, it is apparent that Echinacea is a useful herb in helping to bolster the immune system when the first signs of a virus set in. It has been shown to have the greatest benefits when it is taken at the beginning of a cold, and helps to lesson the duration and symptoms of the sickness. However, research reveals that this herb should not be taken continually in hopes that it will prevent sicknesses because there may be destructive side-effects to body tissues as a result of the heightened number of free radicals in the system.

fyi.

there's also the fact that if you have a disease which is linked to an overactive immune system (rheumatoid arthritis, lupus, some thyroid diseases), you should not take echinacea or zinc or co q-10 at all. if you feel you must, then check with your doctor first.

(oh, look! my immune system is systematically destroying my connective tissue! i think i'll give it a boost! yay, how smart i am!)