The nutritionally important forms of Vitamin D in man are Calceferol (Vitamin D2) and Cholecalciferol (Vitamin D3) Calciferol may be derived by irradiation of the plant sterol, ergosterol, Cholecalciferol is the naturally occurring Performed Vitamin D which is found in animal fats and fish liver oils.
It is also derived from exposure to UV rays of the sunlight which converts the cholesterol in the skin to vitamin D. Vitamin D is stored in the fat deposits.

Daily requirements:
The daily requirements of vitamin D are…
- Adults – 2.5 mcg (100 IU)
- Infants and children – 5.0 mcg (200IU)
- Pregnancy and lactation – 10.0 mcg (400 IU)
(One international unit (IU) of vitamin D = 0.025 mg of calciferol -that is, to convert IU to micrograms, divide by 40).
Sources:
Vitamin d is unique because it is derived both from sunlight and foods…
(a) Sunlight: Vitamin D is synthesized by the body by the action of UV rays of sunlight of 7 dehydrocholesterol, which is stored in large abundance in the skin. Exposure to UV rays is critical; these can be filtered off by air pollution. Dark-skinned races such as Negroes also suffer from this disadvantage because black skin can filter off up to 95 percent of UV rays.

(b) Foods: Vitamin occurs by only in the foods of animal origin. Liver, egg yolk, butter and cheese and some species of fish contain useful amounts. Fish liver oils, although not considered to be a food, are the richest sources of Vitamin d. Human milk has recently been shown to contain considerable amounts of water-soluble vitamin D sulfate. Other sources of vitamin D are foods artificially fortified with vitamin D, such as milk, margarine, vanaspathi and infant foods. Find out more on Vitamin D sources and benefits.

Golds G asks if you can have too much vitamin D. You definitely can take too much vitamin D in supplement form. Doctors generally recommend against taking more than 4000 International Units a day.
Vitamin D-are you getting enough?
The Practitioner that I went to had just come from a conference where Vitamin D had been discussed and she was amazed at all the things that it does for us.
Vitamin D – you probably need more of the “sunshine vitamin
Vitamin D also encourages muscle development. Recent studies done at the University of Manchester have determined that young girls (12-14 years) who were supplemented with vitamin D demonstrated more muscular strength and explosive [...]
Author: Dr John Anne
Dr John Anne Also Read Vitamin Information – Benefits, Deficiency, Sources
Find complete and updated information on vitamin, vitamin c, health food vitamin, vitamin b12, vitamin supplement, vitamin world, vitamin e, vitamin D, vitamin b, vitamin k, vitamin a, liquid vitamin, vitamin b complex, vitamin and mineral, multi vitamin. Read http://www.healthvitaminsguide.com – Information on Vitamins, Minerals, Amino Acids.
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Sun exposure can be considered as the most important vitamin D natural source. It offers us plenty amount of 

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It’s long been known that vitamins and other natural supplements can assist the body in helping to ward off certain ailments, but to the extent that something like the readily available and inexpensive vitamin D actually being able to 


Taking it in high dosage can be potentially dangerous and may give you a vomiting, nausea, weight loss, constipation and poor appetite. For your best interest, it’s better to consult it with your doctor to determine the exact cause you have this disorder, and whether or not you have vitamin D deficiency.

The variant of the D vitamin that is formed under the skin is known as vitamin D3, or cholecalciferol. This D vitamin is created when the ultraviolet in the sunlight reacts with a type of cholesterol that is found under the skin naturally. The D3 is converted into a more active form of the d vitamin in the liver and is then diverted to where it is needed the most. Some of the D vitamin remains in the liver and kidneys to help reabsorb the calcium from the blood. The rest of the D vitamin is dispersed to the bones to help them retain their calcium and the intestines to aid absorption of calcium from food.

