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Journal of Clinical Endocrinology & Metabolism, Vol 61, 391-393, Copyright © 1985 by Endocrine Society

ARTICLES

Calcium bioavailability from calcium carbonate and calcium citrate

MJ Nicar and CY Pak

Fourteen normal subjects took 1000 mg calcium orally as calcium citrate or calcium carbonate. The amount of calcium absorbed was estimated from the rise in urinary calcium. The urinary calcium following calcium citrate load significantly higher (by 20-66%), whether expressed as the total amount or as the increment above basal (fasting) excretion. Thus, calcium citrate provides a more optimum calcium bioavailability than calcium carbonate.




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Copyright © 1985 by The Endocrine Society