Sources of Vitamin D Exposure to sunlight is the main source of access, while food sources are not generally sufficient (2) , and exposure to sunlight for 10-15 minutes on sunny days two to three per week (1) , while those with dark skin To longer periods (2) . As for its sources of food, fish liver oils are the highest, and is found in small amounts in butter, cream, egg yolk, and liver, 1 and vitamin D can be obtained from its nutritional supplements 2 and fortified foods such as juices, Milk, and margarine (3) . Mother's milk, unprocessed bovine milk is a weak source of vitamin D, and the baby who breastfeeds breast milk should be given vitamin D supplements under the supervision of a doctor, while milk for children (formula milk) is always fortified with vitamin D