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About Vitamins |
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| Vitamin A: Best Food Sources - Parsley, sweet potatoes, watermelon, nettle
leaf, broccoli, carrots, dark leafy greens, eggs, and mangos.
Vitamin A is an essential human nutrient. It exists, not as a
single compound, but in several forms. In foods of animal origin the major
form of vitamin A is an alcohol (retinol), but can also exist as an aldehyde
(retinal), or as an acid (retinoic acid). The precursor to the vitamin (a
provitamin) is present in foods of plant origin as a member of the carotene
family of compounds.
All forms of vitamin A have a Beta-ionone ring to which an isoprenoid chain
is attached. This structure is essential for the vitamin activity.
| retinol, the animal form of vitamin A, is a yellow
fat-soluble, antioxidant vitamin with importance in vision and bone
growth. |
| other retinoids, a class of chemical compounds that are
related chemically to vitamin A, are used in medicine. |
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More
Vitamin A
resources
FUNCTIONS OF VITAMIN A IN BODY Vision; maintenance
of cornea, epithelial cells, mucus membranes, skin, bone and tooth growth,
reproduction, immunity.
SYMPTOMS OF VITAMIN A DEFICIENCY Night Blindness,
corneal drying(xerosis), Triangular grey spots on eye(Bitot's spots), corneal
degeneration and blindness(xerophthalmia), impaired immunity,
Hypokeratosis(white lumps at hair follicals, Softenening of the Cornea (keratomalacia)
Vitamins are nutrients required in very small amounts for
essential metabolic reactions in the body . The term vitamin does not
encompass other essential nutrients such as dietary minerals, essential
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