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Do Cold-Preventing Products Really Work?

Step into any supermarket and you'll see them: A slew of products that claim to prevent colds. However, there are currently no documented studies that have found any of these products to be effective. That said, some products that contain zinc, like Zicam, have been shown to shorten the duration of illness, but only when taken right at the onset of a cold (the first day or two that you experience symptoms). My advice: Since many of these picks contain extra-concentrated levels of vitamins and minerals, always check with your doctor before taking any product.

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