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Anise seeds

These licorice-flavored seeds, which have antibacterial properties, have been shown to ease coughing and help clear congestion from the upper respiratory tract.

Anise seeds can be eaten (in rolls and cookies, for instance), but for cold-fighting the delivery method of choice is usually tea. According to the American Pharmaceutical Association's Practical Guide to Natural Medicines, a typical recipe is to add one cup of crushed anise seeds to one cup of hot water, and flavor with sugar, garlic, cinnamon, or honey (if desired). Sip this concoction up to three times a day.

Next: Citrus fruits