Group D vitamins derivate under the influence of an ultraviolet in fabrics of animals and plants from sterins.

Group D vitamins consist of such vitamins:

Vitamin D2:
Vitamin D3:
Vitamin D4:
Vitamin D5:
Vitamin D6

Vitamin D can be found in such food, as: egg yolk, butter, cheese, cod-liver oil, caviar and dairy products.

Vitamin D derivates in skin under the influence of solar rays of pro vitamins. Pro vitamins, in turn, partially arrive in an organism in ready form from plants and are partially derivates in fabrics of their cholesterol.

As our organism receives enough of ultra-violet radiation the need for vitamin D is compensated completely. However, the quantity of the vitamin D synthesized under the influence of sunlight depends on such factors as:

Light wavelength (the average spectrum of waves which we receive in the morning is most effective);

Initial pigmentation of a skin (if the skin is more dark the less vitamin D it is worked out under the influence of a sunlight);

Age (the growing old skin loses the ability to synthesize vitamin D);

Level of impurity of atmosphere;

Additional food sources of vitamin D can be found in dairy products, cod-liver oil and an egg yolk. However, in practice milk and dairy products not always contain vitamin D or contains only insignificant quantities of it (for example in 100 grams of cow milk contains only 0,05 mg of vitamin D) therefore their consumption, unfortunately, cannot guarantee a coating of our requirement for this vitamin. Besides, in milk contains the considerable quantity of phosphorus which interferes with vitamin D absorption.

The main function of vitamin D is supporting of normal growth and development of bones and the rickets and osteoporosis warning. It regulates a mineral exchange and promotes calcium adjournment in a bone fabric.

Vitamin D is unique vitamin which operates both as vitamin, and as a hormone. As vitamin it supports level inorganic Р and Sa in plasma of blood above threshold value and raises the absorption of Sa in a small intestine.

However the vitamin D role is not limited to protection of bones as it also minimizes the organism’s susceptibility to skin diseases, heart troubles and a cancer. He warns weakness of muscles, raises the immune system is necessary for normal coagulability of blood and proper functioning of a thyroid gland. So, at intake of of vitamin D3 decreases the visibility of psoriasis.

There is data that vitamin D helps an organism to restore the protective shells surrounding nerves, therefore it switches on in complex therapy of a multiple sclerosis.

Vitamin D3 participates in regulation of arterial pressure in particular, at a hypertension for pregnant women and palpitation. Vitamin D interferes with cancer growth and cages and does its effective preventive maintenance and treatment of a cancer of a breast, glands, a brain, and also preventive maintenance of leukemia.

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