According to the Office of Dietary Supplements, a division of the National Institutes of Health, all formulas sold in the United States provide at least 400 IU vitamin D per liter, and the majority
of vitamin D-only and multivitamin liquid supplements provide 400 IU per serving (be sure to read the labels).
Other natural sources of vitamin D are beef liver, cheese, egg yolks and mushrooms. Be sure to include these foods in your family's daily diet, too.
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