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Optimal vitamin D dosage for infants uncertain
Date:4/30/2013

in any of the groups. The 1,600-IU/d dosage was discontinued prematurely because of elevated plasma 25(OH)D concentrations."

Overall, 97 percent of infants in all treatment groups achieved the secondary outcome of 50 nmol/L or greater of plasma 25(OH)D by 3 months of age, with no differences among groups. This concentration was sustained in 98 percent of infants at 12 months.

Bone mineral concentration increased over time for lumbar spine, femur, and whole body but did not differ by group.

"Our primary objective was to establish a vitamin D dosage that would support a plasma concentration of 25(OH)D of 75 nmol/L or greater in 97.5 percent of infants at 3 months of age. Only the 1,600-IU/d dosage of vitamin D met this criterion; however, this dosage was discontinued because most infants in that group developed elevated plasma 25(OH)D concentrations that have been associated with hypercalcemia [higher-than-normal level of calcium in the blood]," the authors write. "Thus, the primary outcome was not achieved at 3 months, when plasma 25(OH)D concentrations were highest; all dosages failed except the highest dosage, which appears to be too high."

"Additional studies are required before conclusions can be made regarding higher targets or the needs of high-risk groups."

(JAMA. 2013;309(17):1785-1792; Available pre-embargo to the media at http://media.jamanetwork.com)

Editor's Note: Please see the article for additional information, including other authors, author contributions and affiliations, financial disclosures, funding and support, etc.

Please Note: An author podcast on this study will be available post-embargo on the JAMA website.

Editorial: Targeting Dietary Vitamin D Intakes and Plasma 25-Hydroxyvitamin D in Healthy Infants

Steven A. Abrams, M.D., of the Baylor College of Medicine, Houston, comments on the fin
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Contact: Hope Weiler
hope.weiler@mcgill.ca
The JAMA Network Journals
Source:Eurekalert

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