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Fat Soluble Vitamins
The fat soluble vitamins are A, D, E, F and K. They are supplied to us
in fats and oils, which are then absorbed in the digestive tract and transported
around the body mainly in the lymphatic vessels. They can be stored in
the body, so they do not need to be supplied on a daily basis. They are
usually measured in International Units or IUs, which is a quality based
measurement. For example, 4500mcg of beta carotene, the vegetable form
of vitamin A, is equivalent in potency to 2250mcg of vitamin A oil, from
fish liver. Both equal 7,500lU of vitamin A. The standards against which
lUs are set are as follows:
1 IU of vitamin E= 1mg of alpha tocopherol (E)
1 IU of vitamin A= 0.6mg of beta carotene (A)
1 IU of vitamin D= 0.025 mg of pure vitamin (D)
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