Don't worry about too much vitamin D from overexposure. Your skin allows only a certain amount to be made. In the United States, milk is usually fortified with vitamin D . Milk makes the ideal place to supplement with vitamin D because it is the main source for calcium for children, and vitamin D aids in the use of calcium for bones. Baby formulas are vitamin D fortified.
Vitamin D is potentially toxic , especially to young children.
Symptoms appear at just five times the recommended amount. Too much can cause diarrhea, headache and nausea. If overdoses continue the vitamin will increase the level of calcium in your blood to dangerous levels. This calcium then gets deposited in the soft tissues like the heart and other vital organs. The recommended daily intake for ages one to 24 is 10 micrograms.