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Cold remedies: What works, what doesn't, what can't hurt

Zinc

Some studies show that zinc lozenges or syrup may prevent a cold or shorten symptoms. Other studies show zinc doesn't help.

Zinc can have harmful side effects.

The U.S. Food and Drug Administration advises against using products with zinc you put in your nose. They can cause you to lose your sense of smell. Talk with your healthcare professional before using zinc.