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Doctors and researchers question the efficacy of many common over-the-counter treatments for colds and flus.

Jeff Greenberg/Jeffrey Greenberg/Universal Images

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Jeff Greenberg/Jeffrey Greenberg/Universal Images

Doctors and researchers question the efficacy of many common over-the-counter treatments for colds and flus.

Jeff Greenberg/Jeffrey Greenberg/Universal Images

When you stroll down the cold and flu aisle in a drugstore, it’s easy to get lost in the dizzying array of products promising to clear sinus pressure, dry up sniffles and stop plaguing coughs. Some concoctions even offer it all in one magical pill.

But doctors say the science behind some of those