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LEARNING ABOUT COMMON VITAMINS: VITAMIN A
Known as Anti-Ophthalmic Vitamin. Usually measured in USP units, or International Units (IU), which for vitamin A are identical.
Functions
Builds resistance to all kinds of infections. It is a \"membrane conditioner\" - it keeps mucous linings and membranes of the body in healthy condition. Prevents eye diseases, counteracts night blindness and weak eyesight by helping in formation of visual purple in the eye. Plays vital role in nourishing skin and hair. Essential during pregnancy and lactation. Helps to maintain testicular tissue in a healthy state. Promotes growth and vitality. Aids in secretion of gastric juices and in digestion of proteins. By improving the stability of tissue in cell walls it helps to prevent premature aging and senility; increases life expectancy and extends youthfulness. Protects against the damaging effect of polluted air. Increases the permeability of blood capillaries contributing to better tissue oxygenation.
Deficiency symptoms
Prolonged deficiency may result in eye inflammations, poor vision, night blindness; increased susceptibility to infections, especially in the respiratory tract; frequent colds; retarded growth in children; lack of appetite and vigor; defective teeth and gums; rough, scaly and dry skin, and such skin disorders as acne, pimples, boils, premature wrinkles and psoriasis; dry, dull hair, dandruff and excessive hair loss; nails which peel or are ridged; poor senses of taste and smell.
Natural sources
Colored fruits and vegetables, particularly carrots, green leafy vegetables (such as kale, turnip greens, and spinach), melon, squash, yams, tomatoes, eggs, summer butter, fertile eggs and whole milk. The richest natural source is fish liver oils.
MDR (minimum daily requirement):
4,000 units. Infants: 1,500 units. Usual therapeutic doses 25,000 to 50,000 units a day. Can be given up to 125,000 a day for a limited period of not more than four weeks, under doctor\'s supervision.
*142/103/5*
GENERAL HEALTH
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