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Which can't seem to be duplicated in a double blind study.
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What, specifically, are you talking about?
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Head-On, Airborne, and Enzyte come to mind
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Yeah I don't know anything about these products (although I've had a medical professional who frequents this board recommend Zicam based on experience, I haven't actually tried it).
I had more herbal/traditional remedies in mind when talking about "alternative"... you know, the stuff "modern medicine" comes from... although ineffective and advertised would also describe main-stream over the counter cough medicine.