Gourt > Health > Nutrition > Nutrients > Vitamins and Minerals > Vitamin A
| Vitamin A (Retinol) | |
| General | |
|---|---|
| Chemical formula | C20H30O |
| Molecular weight | 286.456 g/mol |
| Vitamin properties | |
| Solubility | Fat |
| RDA (adult male) | 900 µg/day |
| RDA (adult female) | 700 µg/day |
| RDA upper limit (adult male) | 3,000 µg/day |
| RDA upper limit (adult female) | 3,000 µg/day |
| Deficiency symptoms | |
Retinol, the dietary form of vitamin A, is a fat-soluble, antioxidant vitamin important in vision and bone growth. It belongs to the family of chemical compounds known as retinoids. Retinol is ingested in a precursor form; animal sources (milk and eggs) contain retinyl esters, whereas plants (carrots, spinach) contain pro-vitamin A carotenoids. Hydrolysis of retinyl esters results in retinol while pro-vitamin A carotenoids can be cleaved to produce retinal. Retinal, also known as retinaldehyde, can be reversibly reduced to produce retinol or it can be irreversibly oxidized to produce retinoic acid. The best described active retinoid metabolites are 11-cis-retinal and the all-trans and 9-cis-isomers of retinoic acid.
Discovery
In 1913, Elmer McCollum, a biochemist at the University of Wisconsin, and colleague Marguerite Davis identified a fat-soluble nutrient in butterfat and cod liver oil. Their work confirmed that of Thomas Osborne and Lafayette Mendel, at Yale, which suggested a fat-soluble nutrient in butterfat, also in 1913 Semba RD. Vitamin A as "Anti-Infective" Therapy, 1920–1940. Journal of Nutrition. 1999;129:783-791. PMID 10203551. Full Text Available. Vitamin A was first synthesized in 1947. More on [ Retinol ]
Been spoilt with a large amount of vitamin A over the past 24hrs : )
RossWiddows (Ross ) Tue, 07 Feb 2012 17:48:13 -0000
Been spoilt with a large amount of vitamin A over the past 24hrs : )
@blz5k - I think I have a vitamin in my lung now. At least ur not like that ONE guard who ALWAYS has his fly open. Car level is crotch level
EtaVirginis (Zaniah) Tue, 07 Feb 2012 17:48:01 -0000
@blz5k - I think I have a vitamin in my lung now. At least ur not like that ONE guard who ALWAYS has his fly open. Car level is crotch level
Solgar B2 Vitamin 100 Mg. * - 100 Vegicaps: Vitamin B2 plays a role in cellular respiration, keeping the machine... http://t.co/Egvh3cDC
Daynaual (Dayna Halasz) Tue, 07 Feb 2012 17:47:38 -0000
Solgar B2 Vitamin 100 Mg. * - 100 Vegicaps: Vitamin B2 plays a role in cellular respiration, keeping the machine... http://t.co/Egvh3cDC
@KrisMcmorris How I wish! :) Although...I am Vitamin D deficient. A trip to HI would help!
jennsbookshelf (Jenn Lawrence) Tue, 07 Feb 2012 17:47:16 -0000
@KrisMcmorris How I wish! :) Although...I am Vitamin D deficient. A trip to HI would help!
@Breeze_LaRoc take a multi gummy vitamin like me I never catch a cold
BLU_INDIGO (ALEXIS M.) Tue, 07 Feb 2012 17:47:12 -0000
@Breeze_LaRoc take a multi gummy vitamin like me I never catch a cold
NOW COQ10 (Co-Enzyme Q10) 60 mg - 120 Softgels: Coenzyme Q10 is a vitamin-like compound called ubiquinone. It is... http://t.co/hNbj0XxY
Ashleekxm (Ashlee Mollema) Tue, 07 Feb 2012 17:46:59 -0000
NOW COQ10 (Co-Enzyme Q10) 60 mg - 120 Softgels: Coenzyme Q10 is a vitamin-like compound called ubiquinone. It is... http://t.co/hNbj0XxY
Facts About Vitamin A and Carotenoids - Extensive information about the fat soluble vitamin including suggested RDA intake, role in human body functions, food sources, and deficiency signs.
Vitamin A - Content that explains correct intake, RDA values, food sources, and necessity in diet.
Meta Description: [ Internet and CD-ROM Publisher on Health and the Environment. ]
Vitamin A - Discussion of function, deficiency, disease prevention, disease treatment, food sources, supplements, new research, and recommendations from the Linus Pauling Institute.
Meta Description: [ Linus Pauling Institute at Oregon State University ]
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Meta Description: [ Vitamin A is essential for the growth of bones, teeth and soft tissues. Vitamin supplement: supports healthy immune function, reduces risk of various forms of cancer, supports healthy blood sugar balance ]
Vitamin A - Vitamin A fact sheet offering details on the functions, health benefits, dosage, sources, deficiency and overdose symptoms of this vitamin.
Meta Description: [ Vitamin A (retinol, beta-carotene) factsheet with information on vitamin A sources, uses, health benefits, dosage, RDA, deficiency symptoms, overdose and toxicity. ]
Vitamin A - Provides basic functions, food sources, requirements, and graph detailing foods high in the vitamin with serving size.
Vitamin A (Retinol) - A detailed description of vitamin A, including information on its functions, health benefits, and deficiency symptoms.
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Meta Description: [ Vitamin A forms part of your daily diet, and plays a certain role in maintaining your health, vitality and wellbeing. ]
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Meta Description: [ Vitamin A or Retinol ]
Vitamin A Supplementation - Vitamin A supplementation advices and guidelines presented by World Health Organization.
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