Calciferol glucuronides

There are few dietary sources of cholecalciferol. The richest sources are oUy fish (especially fish liver oUs), although eggs also contain a relatively large amount, and there is a modest amount in mUk fat and animal liver. In many countries, margarine is fortified with vitamin D. No common plant foods contain vitamin D, although some tropical plants contain calciferol glucuronides that are hydrolyzed in the intestinal lumen and are a source of the vitamin. Indeed, this can be a cause of hypervitaminosis and calcinosis in grazing animals. 

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