Let us talk about vitamin A in this article. Vitamin A is fat-soluble vitamin and includes a number of relatives on structure of connections:
Retinol (vitamin A-spirit, vitamin А1)
Degidroretinol (vitamin А2)
Retinal (vitamin A-aldehyde)
Retinol acid (vitamin A-acid)
For the first time vitamin A has been allocated from carrots, therefore from the word carrot there was a name of group of vitamins A as Carotene. Carotene contains in the plants, some mushrooms and seaweed and in an organism is capable to turn into vitamin A. To the vitamin A concerns a, b and d-carotene, lutein, likopen and other.
The most known Carotene is b-carotene. It is the provitamin of vitamin A which in liver turns to vitamin as a result of oxidizing splitting.
The best sources of vitamin A can be found in cod-liver oil and a liver, among such food is also butter, egg yolks, cream and whole milk. Grain products and milk even with vitamin additives are unsatisfactory sources same as beef where vitamin A contains in very small quantities.
Researches of last years have shown that any of vegetative or animal products cannot fill shortage of vitamin A, therefore is necessary to add vitamin A as a supplement to your daily eating menu.
Vitamin A participates in oxidation-reduction processes, regulation of synthesis of fibers, promotes a normal metabolism, function of cellular and subcellular membranes, plays the important role in formation of bones and a teeth, and also fatty adjournment; it promotes the growing of new cages, slows down ageing process.
Also it is well known for its beneficial influence on sight: even in the ancient times the boiled liver which is one of the basic sources of vitamin A was used as a mean from night blindness. It has huge healthy value for eye reception, provides normal activity of the visual analyzer, and participates in synthesis of a visual pigment of a retina and light perception.
Vitamin A is necessary for normal functioning of immune system and is an integral part of process of struggle against different infections. The application of Retinol raises barrier function of mucous membranes, increases activity of leukocytes and other factors of nonspecific immunity. Vitamin A protects from colds, flu’s and infections of respiratory system.
Presence of vitamin A in blood is one of the primary factors responsible for easier transferring of such infectious diseases as measles, a chicken pox, whereas in the countries with a low standard of living the death rate is much higher from these “harmless” virus infections.
Also vitamin A is applied at treatment of almost all diseases of a skin as acne, spots, psoriases and other. At skin damages from wounds, solar burns and other vitamin A accelerates healing processes, and also stimulates collagen synthesis, improves quality of again formed fabric and reduces danger of infections.
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