Vitamin A - Wikipedia, the free encyclopedia
Vitamin A is a vitamin which is needed by the retina of the eye in the form of a specific metabolite, the light-absorbing molecule retinal. This molecule is absolutely necessary for ...
http://en.wikipedia.org/wiki/Vitamin_A
Vitamin A
A possible explanation for such a finding is that the oxidative environment of the lung ... Do high intakes of vitamin A increase the risk of osteoporosis?
http://lpi.oregonstate.edu/infocenter/vitamins/vitaminA/
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Vitamin D - Wikipedia, the free encyclopedia
Vitamin D is a group of fat-soluble prohormones, the two major forms of which are vitamin D 2 (or ergocalciferol) and vitamin D 3 (or cholecalciferol). [2]
http://en.wikipedia.org/wiki/Vitamin_d
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Finding Vitamin C or Ascorbic Acid
There are several ways you can use a titration to determine the amount of vitamin C (ascorbic acid) in juice, fruit, or vegetables. One of the best methods is to use an iodometric ...
http://chemistry.about.com/b/2007/02/16/finding-vitamin-c-or-ascorbic-acid.htm
Dietary Supplement Fact Sheet: Vitamin A and Carotenoids
However, decreased biosynthesis of vitamin D associated with lower levels of sun exposure in this population may also contribute to this finding.
http://ods.od.nih.gov/factsheets/vitamina.asp
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