30. You bolster your immune system with extra vitamin C
THE RESULT: You still find yourself with the sniffles.
THE FIX: Keep your vitamin C levels under control: 75mg per day is recommended for women, and 90mg for men. Extra vitamin C hasn’t been proven to prevent colds. (Exceeding 2,000mg per day can cause nausea and other gastrointestinal problems.) What has been proven to work? Washing your hands.