The June issue of Menopause, a peer reviewed medical journal, carried an original research article by Margery Gass, MD and colleagues which indicated that older women are taking too much Vitamin D and Calcium. She conducted a randomized and placebo controlled trial of 163 women with low Vitamin D levels. The age range of the study group was 57 to 90. They were given Vitamin D and Calcium citrate tablets to reach the recommended daily amount of 400 to 4800 IU per day of Vitamin D and 1200 mg of calcium per day. Follow-up lab studies revealed that almost 10% of the women developed elevated blood calcium levels. More disturbing was the fact that 31% developed elevated levels of calcium in their urine predisposing them to kidney stones.
The lead author suggested that every patient calculate how much calcium they are getting daily in their normal diet before supplementing it with extra calcium. Her group pointed out the benefits of clinicians periodically measuring patients 24 hour urine calcium level. Those with a level > 132 mg were at much higher risk of developing hypercalcemia and its complications and need to reduce their supplemental calcium intake. We will begin suggesting 24 hour urine collection in our patients in the near future.
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