Vitamin D plays an important role in the absorption of calcium as well as bone growth and remodeling. It also plays a part in regulating the functions of the immune system as well as reducing inflammation. Vitamin D is not naturally present in many food because it is predominately produced in the body as a result of exposure to direct sunlight. However vitamin D levels can be supported by dietary intake, especially in people who do not have high levels of exposure to sunlight. Food such as cod liver oil, fish, milk and egg are good sources of vitamin d. It is recommended that production of vitamin D is primarily resulting from contact with sunlight however an intake of up to 10*g may be required for those who are house ridden or receive very little sunlight this can be obtained from 2/3 cup cod liver oil, 180g salmon or 8 cups of milk.