Vitamin D3 requirement


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Vitamin D3 is a hormone that has an important role in calcium and phosphorus metabolism. Vitamin D3 also known as cholecalciferol produced by the body when exposed to ultraviolet light or obtained from dietary sources.
Vitamin D3 plays a great role in the human body: helps the body absorb calcium, and this helps to maintain strong and healthy bones. Other function of Vitamin D3 is help bones mend and heal after injury. Vitamin D3 can help reduce inflammation in the body. Also there are evidence that vitamin D3 may also help prevent high blood pressure as well as some types of cancer.

The vitamin D3 requirement of healthy adults has never been precisely defined. Since vitamin D3 is produced in the skin on exposure to sunlight and can be retained in vertebrate tissues; humans may not have a requirement for vitamin D when sufficient sunlight is available.

However, vitamin D3 does become an important nutritional factor in the absence of sunlight.
In addition to geographical and seasonal factors, UV light from the sun may be blocked by factors such as air pollution, clothing, and sunscreens.

In fact, as air pollution became prevalent, the incidence of rickets became widespread in industrial cities.

In addition to these man-made barriers to adequate sunlight exposure, there is insufficient sunlight at northerly latitudes to maintain adequate levels of vitamin D3 in the skin. Under these conditions, vitamin D3 becomes a true vitamin in that it must be supplied in the diet on a regular basis.

The requirement for vitamin D3 is also dependent on the concentration of calcium and phosphorus in the diet, the physiological stage of development, age, sex, degree of exposure to the sun, and the amount of pigmentation in the skin.

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