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7. Cereal
A bowl of fortified oatmeal can add a considerable dose of vitamin D to your diet. Ready-to-eat fortified cereal typically gives you 40 IU of vitamin D per serving, according to the NIH, but it may give you more if you reach for a more heavily fortified cereal, like Raisin Bran, which has 60.2 IU per cup, notes the U.S. Department of Agriculture.
Keep in mind that fortified cereal can be a strong base for a nutrient-rich, high-fiber meal—especially if you add some fortified low-fat or fat-free milk to your bowl for an extra 60 IU per half cup.