This B vitamin works as an antioxidant to help fight free radicals (particles in the body that damage cells). It may also prevent early aging and the development of heart disease . And, riboflavin is important for red blood cell production, which is necessary for transporting oxygen throughout the body. Several studies suggest B2 can help stave off migraines, but more research is needed to be sure. And be careful, while sunlight does the body good, ultraviolet light reduces the riboflavin content in food sources. You should purchase milk, for instance, in opaque containers in order to keep this vitamin from breaking down.
Vitamin D -- If you want to avoid catching the flu, one Japanese study conducted with school children suggests that taking vitamin D3 supplements may reduce the risk of contracting influenza A by as much as 58 percent. In fact, individuals with vitamin D deficiencies often have a higher incidence of catching colds, so it’s a good idea to ensure that you get your daily requirement of this essential vitamin. Because we spend more time indoors during the winter months and are likely to produce less vitamin D naturally, you’ll want to boost your daily dosage by taking supplements.