No one wants to get sick. In fact, most people would do just about anything to prevent the coughs, sniffles, and sneezes. And forget about the dreaded nasal drip where you’re going through a box of tissues or two a day, and your nose resembles Rudolph the Red-Nosed Reindeer’s. Sure, you could load up on vitamin C, eat a well-balanced diet, and exercise regularly, but there’s one thing that not many people think about when it comes to boosting their immunity — Vitamin D.