Abstract
Two hundred sixteen women (34–69 years) participated in a clinical trial to study the short-term (14 days) effects of calcium supplementation (1000 mg extra calcium given as oyster shell calcium) on urinary calcium and magnesium excretion. Before supplementation the women consumed an average of 879 mg Ca/day in self-selected diets; during supplementation they consumed approximately 1915 mg Ca/day (diet and supplement). The women excreted significantly more calcium in the urine during the supplementation period than initially (114 vs. 149 mg Ca/day) but this increase accounted for only 3.4% of the supplemental calcium. Approximately 24% of the women did not respond to the calcium supplements; they excreted less or equal amounts of urinary calcium in response to calcium supplementation. Hypercalciuria (>250 mg Ca/day) was observed in 3% of the women prior to supplementation and 7% of the women during calcium supplementation. Calcium supplementation had no effect on urinary magnesium excretion.
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