Vitamins. Absorption and malabsorption

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Abstract
Absorption of all vitamins is dependent on an intact [human] small intestine mucosa; vitamin B12 requires the ileum for absorption and all other vitamins depend mostly on the jejunum. In addition, vitamins A, D, E and K must have bile and fat present in the small intestine in order to be absorbed. Vitamin B12 absorption also requires a gastric mucosa capable of producing IF [intrinsic factor] and the absence of bacteria or parasites in the upper small intestine. As a corollary, malabsorption of vitamins can occur when the required intestinal milieu is not present.

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