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The National Dairy Council reported in its 2000 report Newer Knowledge of Dairy Foods, available on the organization's website:
“Vitamin D-fortified milk is the primary food source of vitamin D in the U.S. This vitamin plays an important role in calcium absorption and metabolism. Two 8-ounce servings of vitamin-D fortified milk provide the amount of vitamin D currently recommended for children of all ages (200 IU/day)…
Without consuming dairy foods, it is difficult for adolescents to meet recommended intakes of calcium and vitamin D…
Vitamin D-fortified milk helps adults, particularly older adults, meet their need for vitamin D… Vitamin D-fortified milk contains 400 IU (10 µg) of vitamin D per quart.”
2000