Does anybody know if echinacea really works when it comes to fighting off a cold? I heard that if you start to take it at the beginning of your cold, it helps boost your immune system and you are more likely to not get fully sick?!?

I have tried olive leaf extract (read about it in one of those alternative medicine flyers you get in the mail). From what I can tell this works. Also, recently read elderberry extract is excellent also for stopping viruses in the tracks.. Both boost the immune system... Again-- info. comes from the flyers; think I am a believer