- MedlinePlus Encyclopedia: Vitamin A
Describes benefits, sources, problems resulting from deficiency, and more.
www.nlm.nih.gov/medlineplus/ency/article/002400.htm
- Wikipedia: Vitamin A
User-generated article about the essential human nutrient vitamin A, its discovery, recommended daily intake, food sources, deficiency, and overdosage effects.
en.wikipedia.org/wiki/Vitamin_A
- Linus Pauling Institute: Vitamin A
Extensive overview of retinoid compounds, their effects on vision, gene expression, and immunity, interactions with other nutrients, sources, and more.
lpi.oregonstate.edu/infocenter/vitamins/vitaminA
- HealthLink: Vitamin A and Carotenoids
Explains the role of essential provitamin A carotenoids and Vitamin A for better and healthy vision, bone growth, and regulation of the immune system.
healthlink.mcw.edu/article/980793489.html
- WHFoods: Vitamin A
Describes what is vitamin A, its functions, as well as deficiency and toxicity symptoms.
www.whfoods.com/genpage.php?tname=nutrient&dbid=106
- Vitamin A
Ohio State University Extension fact sheet about good sources of Vitamin A, serving sizes, and more.
ohioline.osu.edu/hyg-fact/5000/5551.html
- Facts about Vitamin A and Carotenoids
Extensive overview of Vitamin A from the National Institutes of Health Office of Dietary Supplements.
ods.od.nih.gov/factsheets/vitamina.asp
- WHO: Vitamin A Supplementation
Offers the World Health Organization (WHO) perspective about vitamin A supplementation including public health strategies, advices and guidelines, as well as statistics on vitamin A coverage and disease incidence.
www.who.int/vaccines/en/vitamina.shtml
- Beta Carotene@
dir.yahoo.com/.../Nutrients/Beta_Carotene
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