Fat-soluble vitamins are stored in tissues
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Fat-soluble vitamins are not as readily absorbed or extracted from the diet as water-soluble vitamins but ample reserves are stored in tissues. With the exception of vitamin K they do not act as coenzymes. Indeed, vitamins A and D behave more like hormones. Note that vitamin A and vitamin D can be toxic in excess amounts. This is not true of either vitamin E or K.
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