Recommended Daily Dose of Vitamin

Doses or intake of vitamin D is determined according to age groups. These amounts are vital to maintain normal growth and bone health and also normal calcium metabolism in the body. The adequate intakes or AIs for vitamin D indicated are based on the supposition that the vitamin D is not synthesized by sunlight exposure.

From birth to age 13, the recommended AI for children is 5 mcg or 200 IU; for both males and females aged 14-50 years old, 5 mcg or 200 IU is needed; for both males and females aged 51-70 years of age, 10 mcg or 400 IU is required; both males and females reaching the age of 71 and up require 15 mcg or 600 IU of vitamin D. Pregnant and lactating mothers need 5 mcg or 200 IU of the vitamin.

Vitamin D Food Sources

Only a few food sources contain vitamin D. Best sources of vitamin D are fish meat and fish liver oils. There are also small amounts of vitamin D, in the form of vitamin D3, found in dairy products like cheese and egg as well as beef and liver. Some types of mushrooms also contain varying amounts of vitamin D2.

Common sources of vitamin D include the following: * Cod liver oil

* Fish like salmon, mackerel, tuna, sardines

* Milk including non-fat, reduced fat, whole or vitamin D fortified

* Margarine

* Cereals

* Egg

* Beef liver

* Swiss cheese

* Fortified orange juice

* Fortified rice or soy beverage

The Need for Increased Amounts

Since obtaining sufficient amounts of vitamin D in the diet can be quite difficult, many people now consume vitamin D fortified foods in order to maintain a healthy dose of the vitamin. There are some groups however who need increased amounts of vitamin D:

* Breastfed infants because vitamin D cannot be supplied by breast milk alone

* Older people due to the fact that synthesis of vitamin D decreases with age and the ability of the kidney to convert vitamin D diminishes

* People with limited sun exposure especially those living in northern latitudes, those wearing robes or head covers or those with occupations that prevent them from having sun exposure

* People with dark skin as more skin pigments like melanin reduces the ability of the skin to produce vitamin D.

* People with fat malabsorption conditions such as Crohn's disease, cystic fibrosis, liver and celiac disease or patients who have undergone surgical removal of any part of the stomach or intestine.

* People who are obese. An increased amount of subcutaneous fat can snatch more of the vitamin D and somehow alter its release in the circulation.