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Effect of cholecalciferol on the systolic blood pressure in hypertensive, vitamine D insufficient patients.

To evaluate the effect of cholecalciferol supplection on the systolic blood pressure in hypertensive patients with a 25-hydroxycholecalciferol insufficiency. Secondly, the effects on PRA, aldosteron, 25-hydroxycholecalciferol, alkaline phosphatase,…

Liposoluble vitamins in patients receiving long-term octreotide treatment

To determine the frequency and severity of liposoluble vitamin malabsorption side effects of long term octreotide treatment and/or small bowel resection

The effect of vitamin D-supplementation on insulin sensitivity in non-western immigrants in the Netherlands

To assess whether supplemention of vitamin D3 (1200 IU/day) in vitamin-D deficient non-western immigrants at risk for type 2 diabetes mellitus can improve the insulin resistance and betacell function as well.