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 ]
Taking my one a day vitamin :)
ValerieGiron (valerie) Thu, 10 Dec 2009 03:20:21 -0000
Taking my one a day vitamin :)
I think wearing a mask, taking vitamin C and using hand sanitizers work well in protecting yourself from catching the flu but its not 100%.
Tokyoheadhunter (Al Isago Parvez ) Thu, 10 Dec 2009 03:18:40 -0000
I think wearing a mask, taking vitamin C and using hand sanitizers work well in protecting yourself from catching the flu but its not 100%.
@LogosNoesis laughter has sooo many benefits, on so many levels. What if it could be recognized like a daily vitamin of mirth?
cecilemiranda (Cecile Miranda) Thu, 10 Dec 2009 03:18:07 -0000
@LogosNoesis laughter has sooo many benefits, on so many levels. What if it could be recognized like a daily vitamin of mirth?
Health Care Guide » Blog Archive » Deep Wrinkle Serum â How to ...: A popular one is the vitamin E scam: many s.. http://tinyurl.com/ykcvs6w
antiagingvitami (Graciela Vegas) Thu, 10 Dec 2009 03:17:41 -0000
Health Care Guide » Blog Archive » Deep Wrinkle Serum – How to ...: A popular one is the vitamin E scam: many s.. http://tinyurl.com/ykcvs6w
Kid A is beautiful. I'm crying into my vitamin water.
megbeebee (Meghan B.) Thu, 10 Dec 2009 03:16:50 -0000
Kid A is beautiful. I'm crying into my vitamin water.
Are tat sleeves now a requirement to be a #Top Chef? Hope they take extra Vitamin D.
MickiMaynard (MickiMaynard) Thu, 10 Dec 2009 03:16:13 -0000
Are tat sleeves now a requirement to be a #Top Chef? Hope they take extra Vitamin D.
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 ]
Vitamin A - Featuring information on the health benefits of vitamin A.
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.
Vitamin A and Your Nutrition - Includes body functions, suggested intake, and food sources high in the vitamin.
Meta Description: [ Vitamin A forms part of your daily diet, and plays a certain role in maintaining your health, vitality and wellbeing. ]
Vitamin A or Retinol - Discussion of the fat soluble vitamin including proper dosage, necessity in diet, and graph indicating good food sources.
Meta Description: [ Vitamin A or Retinol ]
Vitamin A Supplementation - Vitamin A supplementation advices and guidelines presented by World Health Organization.
| Prep to Survive 7 | |
| Next Video | |
