Vitamin D is always associated with sunlight. Sun exposure is perhaps the most important source of vitamin D because exposure to sunlight provides most humans with their vitamin D requirement and yet we have to be careful not to overexpose ourselves too much in the sun. Moderation is the key here.
The other source of vitamin D is from our diet. There are only a few food sources of vitamin D. Good sources of vitamin D are fortified foods and beverages like milk, soy drinks, and margarine. Check the labels on these foods. Fish, liver, and egg yolk are the only foods that naturally contain vitamin D. Can we have an overdose of vitamin D? From Wikipedia, "...normal food and pill vitamin D concentration levels are too low to be toxic in adults, because of the high vitamin A content in codliver oil, it is possible to reach toxic levels of vitamin A (but not vitamin D) via this route, if taken in multiples of the normal dose in an attempt to increase the intake of vitamin D. Most historical cases of vitamin D overdose have occurred due to manufacturing and industrial accidents." Read the whole article at: http://wisdomnet.blogspot.com/2008/03/vitamin-d-is-essential-for-bone-he\ alth.html <http://wisdomnet.blogspot.com/2008/03/vitamin-d-is-essential-for-bone-h\ ealth.html>
