So, why are they deficient in D? Don't they drink the same milk as other kids?
8 ounces of vitamin d2 fortified milk is 2.5% of the minimal
amount required to probably insure all of the systematic benefits of vitamin d3.
darker skin means one needs to spend much time in the sun
to get the same amount of cholesterol converted to Vitamin d by the sunshine. African Americans are the most vitamin d deficient of all Americans (hence the worst rate for heart disease, cancer, strokes, and diabetes.