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These mega-supplements have gained popularity as a cure for the common cold. But the evidence behind their immune-system-bolstering effects is inconclusive to say the least.

“A lot of these supplements make quasi-medical claims,” says Dr. Wolfe.

And the claims hardly ever stand up to scientific scrutiny: Airborne paid over $23 million in 2008 to settle a class-action suit about its product’s cold-prevention effects—or lack thereof.

Bottom line: If you’ve got a case of the sniffles, there’s—sniffle—no quick fix.

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The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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