Abstract
This trial assessed calcium excretion, as an indicator of calcium absorption, in 50 healthy men and postmenopausal women (ages 45-75), from a beverage containing calcium, magnesium, vitamins C, D, K, zinc, phosphorous, soy isoflavones, and inulin, compared with a calcium carbonate (CaCO 3) tablet. At the end of each 4-week treatment period, subjects consumed a standardized low calcium meal plus the assigned study product (time = 0 hours). Subjects had significantly higher urinary creatinine-corrected calcium concentrations after the beverage than after the CaCO 3 tablet. During the beverage phase, subjects had 29% and 22% greater mean urinary creatinine-corrected calcium concentrations for 0-6 and 6-72 hours, respectively, compared with the CaCO 3 phase ( p < 0.01 for both). There was no difference between the CaCO 3 and beverage phases in 6-hour post-meal serum calcium or magnesium concentrations. In conclusion, a specially formulated calcium-containing test beverage increased excretion of calcium, compared with a CaCO 3 tablet, suggesting enhanced calcium absorption.
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