Vitamin A is fat-dissoluble. To fully assimilate our food drive requires fats, as well as mineral substances. He may be retained in the body, and the stock should not be replenished every day.
It exists in two forms - is already ready vitamin A (retinol) of the products of animal origin and pro A (carotene).
Vitamin A is measured in Pharmacopoeia USA Units, the International Units (IU) and Retinol Equivalents (RE). The average dose for adults, 10,000 IU daily, the need increases with body mass index.
Benefits
Protects night blindness.
Increases resistance to infection of the respiratory system.
Saves outer skin intact healthy.
To promote the growth and strengthening of bones, the health of skin, hair, teeth and gums.
When an external application helps in the treatment of acne.
The best natural sources: oil the fish liver (fish oil), the liver, carrots, green and yellow vegetables, eggs, milk, margarine and yellow fruit.
Vitamin A acid form (retinol) is sometimes appointed to acne, but it is sold only by prescription.
Normal daily dose is 10.000-25.000 IU.
Toxicity
More than 100,000 IU / day in adults can cause toxic effects if the vitamin in doses for many months.
More than 18.500 IU per day in young children can cause toxic effects.
Exhibiting toxicity is hair loss, insomnia, nausea, vomit, flake skin, rashes, pain in the bones, irregular menstruation women, impotence, and headaches, and increase in liver.
Advice: If you accept the contraception pills, your need for vitamin A reduced.
If your weekly diet includes enough liver, carrots, spinach, sweet potatoes or sugar, vitamin A, you do not need one. Vitamin E works best in combination with B-complex, vitamin D, vitamin E, calcium, phosphorus and zinc.
Vitamin A also prevents vitamin C oxidation. If you accept drugs that reduce cholesterol, you lowered absorbability of vitamin A, you need the supplements.
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