
What about Echinacea. There is some lab research that suggests that this herbal compound can stimulate the immune system and have antiviral effects. Human studies have had inconsistent results. In fact two large studies in 2010 and 3022 found that echinacea was no better than a placebo at preventing or reducing the severity of a cold. The placebo effect can never be overlooked in medicine. A significant % of subjects will respond to a placebo if they believe that it has medicinal benefits.
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