Absorbability of calcium sources: The limited role of solubility

Robert P. Heaney, Robert R. Recker, Connie M. Weaver

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Abstract

Fractional absorption of seven chemically defined calcium sources was measured in normal adult women under standardized load conditions. Solubility of the sources in water at neutral pH ranged from a low of 0.04 mM to a high of 1500 mM. The relationship of solubility to absorbability was weak. In the range from 0.1 to 10 mM, within which most calcium supplement sources fall, there was no detectable effect of solubility on absorption. Data from four food sources are presented for comparison. Absorbability of food calcium was not clearly related to absorbability of the dominant chemical form in the food concerned. These findings suggest that (1) even under controlled, chemically defined conditions, solubility of a source has very little influence on its absorbability; and (2) absorbability of calcium from food sources is determined mainly by other food components.

Original languageEnglish
Pages (from-to)300-304
Number of pages5
JournalCalcified Tissue International
Volume46
Issue number5
DOIs
StatePublished - May 1990

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All Science Journal Classification (ASJC) codes

  • Endocrinology
  • Orthopedics and Sports Medicine
  • Endocrinology, Diabetes and Metabolism

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