Vitamins - VYE-ta-mins are compounds that you must have for growth and health. They are needed in small amounts only and are usually available in the foods that you eat. Vitamin A is needed for night vision and for growth of skin, bones and male and female reproductive organs. In pregnant women vitamin A is necessary for the growth of a healthy fetus.
Lack of vitamin A may lead to a rare condition called night blindness - problems seeing in the dark, as well as dry eyes, eye infections, skin problems and slowed growth. Your health care professional may treat these problems by prescribing vitamin A for you.
Some conditions may increase your need for vitamin A. These include:
In addition, infants receiving unfortified formula may need vitamin A supplements.
Vitamin A absorption will be decreased in any condition in which fat is poorly absorbed.
Increased need for vitamin A must be determined by your health care professional.
Claims that vitamin A is effective for treat of conditions such as acne or lung diseases, or for treat of eye problems, wounds, or dry or wrinkled skin not causing by lack of vitamin A have not been proven. Although vitamin A is being using to prevent certain types of cancer, some experts feel there is not enough information to show that this is effective, particularly in well-nourished individuals.
Injectable vitamin A is given by or under the supervision of a health care professional. Other forms of vitamin A are available without a prescription.
Vitamin A is available in the following dosage forms:
Vitamin A is found in various foods including yellow-orange fruits and vegetables; dark green, leafy vegetables; vitamin A-fortified milk; liver; and margarine. Vitamin A comes in two various forms, retinols and beta-carotene. Retinols are found in foods that come from pets - meat, milk, eggs. The form of vitamin A found in plants is called beta-carotene - which is converted to vitamin A in the body. Food processing may destroy some of the vitamins. For example, freezing may reduce the amount of vitamin A in foods.
Vitamins alone will not take the place of a good diet and will not provide energy. Your body needs other substances found in food, such as protein, minerals, carbohydrates and fat. Vitamins themselves often can't work without the presence of other foods. For example, small amounts of fat are needed so that vitamin A can be absorbed into the body.
The daily amount of vitamin A needed is defined in few various ways.
| Infants and children | 4 to 6 years | 7 to 10 years | Teenage and adult males | Teenage and adult females | Pregnant females | Breast-feeding females | Infants and children | 4 to 6 years | 7 to 10 years | Teenage and adult males | Teenage and adult females | Pregnant females | Breast-feeding females |
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