We've all heard of the virtues of tea (antioxidants, staying young, etc.), but if you're just looking to fight off the sniffles, you don't need the fancy stuff. According to British researchers, chamomile tea is the most effective when it comes to fighting the common cold. In fact, subjects who drank five cups of chamomile tea a day for two weeks revealed increased levels of plant-based compounds, polyphenols, in their blood - these have been linked to increased antibacterial activity. Levels even stayed high for two weeks after subjects dispensed with their tea drinking. Another plus: chamomile tea raises glycine levels, which helps relax nerves and lets you snooze restfully.