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Amen! Sambucol ROCKS! I laugh at these people sucking down their mass-produced NyQuil, Robitussin, and such; which just MANAGE (and poorly, at that) their symptoms, while Sambucol gets in there and FLOORS the problem. I've turned LOTS of friends on to Sambucol, and I've seen it work when a cold or flu starts in on them. In addition to the other items you mentioned, I am also a BIG fan of 'Eucalyptus Radiata' essential oil. No needles/viral injections for me, thank you.
Best to take Echinacea at the very onset of symptoms, and not for too long. It can be very helpful taken that way, by temporarily boosting white blood cell count. However, there's medical evidence to suggest that taking it for extended periods of time when you're healthy might actually weaken one's immune system. Same for Golden Seal.
My sister swears by Sambucol, and she hasn't had so much as the sniffles in years.