| http://www.w3.org/ns/prov#value | - And during the winter, when days are the shortest of the year and sunshine is at a minimum, the eggs in such a sandwich can be an important source of vitamin D. In fact, the U.S. Department of Agriculture recently reviewed egg nutrient data and results showed that one large egg contains 41 IU (International Unit) of vitamin D, 64 percent higher than before.
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