An American study has revealed MOST children in the U.S. have suboptimal vitamin D levels. Healthy blood levels of vitamin D are at least 30 ng/mL; but 2 out of 3 children have levels below this, and about 1 in 5 in the age group 1 to 11 are severely deficient.
The problem is especially severe in Black and Hispanic children. HALF are deficient, with levels below 20 ng/mL. This is probably because their darker skin blocks out more of the sun’s UV-B rays needed for making natural vitamin D.
The American Academy of Pediatrics recommends 400 IU/day of vitamin D, starting days after birth all the way through adolescence. A cup of cow’s milk or baby formula contains only about 100 IU of vitamin D. So only children who drink a quart/day are getting enough.
Source: Natural Medicines Comprehensive Database 21st December 2009