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American Journal of Clinical Nutrition, Vol 56, 533-536, Copyright © 1992 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Effect of iron on serum 25-hydroxyvitamin D and 24,25-dihydroxyvitamin D concentrations

D Heldenberg, G Tenenbaum and Y Weisman
Department of Pediatrics, Hillel-Yaffe Memorial Hospital, Hadera, Israel.

In 13 of 17 infants (aged 10.5 +/- 4.3; mean +/- SD mo) with iron- deficiency anemia, the serum 24,25-dihydroxyvitamin D concentration was below the normal range and in 9 of these 13 the serum 25-hydroxyvitamin D concentration was below the normal range despite the fact that these infants received 10 micrograms vitamin D/d from the age of 1 mo. The infants were treated with intramuscular iron dextran (Imferon). The iron-dextran treatment increased the hemoglobin and serum iron concentrations as well as 25-hydroxyvitamin D and 24,25- dihydroxyvitamin D concentrations. It is known that iron deficiency impairs fat and vitamin A intestinal absorption. Therefore, it is suggested that absorption of vitamin D may also be impaired. This may contribute to the development of vitamin D deficiency. Iron supplementation may have improved the absorption of vitamin D in the small intestine and hence increased the vitamin D concentration in the plasma.


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