This is a fat soluble vitamin, of which the most active form is retinol. Vitamin A is essential for normal growth and for the formation of strong bones and teeth in children, also plays a major role in vision and cell structure, and it provides protection for the linings of the respiratory, digestive, and urinary tracts against infection. It is also essential for healthy skin.
A vitamin A deficiency occurs only in people who have an exceptionally poor diet. The effects of such a deficiency include poor night vision, dry, inflamed eyes, and dry, rough skin. In extreme cases, vitamin A deficiency can result in severe corneal damage that can lead to blindness if left untreated.
Vitamin A is available in many foods, including liver, oily fish, dairy products yolk, margarine, and various fruits and vegetables, such as carrots, kale, broccoli, spinach, apricots, and peaches. The recommended daily allowance for adults is 0.8 to 1 mg.
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