What’s the best way to keep sniffles, sneezes, coughs, and all the misery that comes with catching a a cold this winter and spring? In addition to getting your flu shot, following a balanced diet, washing your hands regularly, and getting plenty of sleep, there are a slew of natural foods and supplements can help boost your immune function—and even science agrees.

Try some of these research-proven fixers to keep you healthy throughout cold and flu season.