New research published in the Canadian Medical Association Journal found that consumption of non-cow’s milk was associated with decreased vitamin D levels compared to the consumption of cow’s milk among children in North America.
Every country has different requirements for the fortification of foods with vitamin D. Canada and the U.S. require cow’s milk contain 40 IU of vitamin D per 100 ml serving. Canada also requires that margarine be fortified.
Vitamin D fortification of food is meant to provide enough vitamin D to prevent the development of childhood rickets. Currently, there is not enough vitamin D found in food sources to rely on diet alone for adequate daily vitamin D intake.