Vitamin D Is Key to a Healthy Immune System, and These 7 Foods Have It in Spades

You may want to skip the egg-white-only omelet and go for the whole egg if you're trying to get in your daily dose of vitamin D. The yolk is a nutrition powerhouse, containing this important nutrient, along with other key vitamins and minerals for immune support, like selenium. Eggs are one of the only foods that naturally has vitamin D. Whether you eat them hard-boiled, scrambled, or fried, don't skip that yolk!