Vitamin A

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Categories: Vitamin

None listedType: Compound
Vitamin: A
Name: Retinal, Retinol
RDA:
Males: 5000 IU
Females: 4000 IU
Importance- to Body:
Required for synthesis of photoreceptor pigments of rods and cones, integrity of skin and mucosae, normal tooth and bone development; normal reproductive capabilities; acts with vitamin E to stabilize cell membranes.
Distribution- in Body:
Group of compounds including retinol and retinal; 90% is stored in liver, which can supply body needs for a year; stable to heat, acids, alkalis; easily oxidized; rapidly destroyed by exposure to light.
Excess Effects:
Toxic when ingested in excess of 50,000 IU daily for months; symptoms: Nausea, Vomiting, Anorexia, Headache, Hair Loss, Bone and Joint Pain, Bone Fragility, Enlargement of Liver, Enlargement of spleen
Deficiency Effects:
Most prevalent vitamin deficiency in the world. Night Blindness, Epithelial changes: Dry Skin, Dry Hair, Skin Sores; Increased Respiratory, Digestive, Urogenital infections, Drying of conjunctiva, Clouding of Cornea
Food Sources:
Formed from pro vitamin carotene found in Deep-Yellow vegetables, and Deep-Green Leafy Vegetables; vitamin A can be found in Fish Liver Oils, Egg Yolk, Liver, Fortified Foods (Milk, Margarine).
Environmental/Geographic Sources:
None listed
Supplemental information:

Synonyms:
Retinol,Retinal
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