Recent reports have implicated the importance of impaired calcium absorption, inadequate
dietary vitamin D, and low serum vitamin d levels in the genesis of metabolic bone diseases …

1. Radio-calcium absorption, plasma 25-hydroxyvitamin D [25-(OH) D] and 1, 25-
dihydroxyvitamin D [1, 25-(OH) 2D] concentrations were measured in 19 elderly women …

This study was conducted to examine the effect of calcium intake on the rise in serum 25-
hydroxyvitamin D [25 (OH) D] levels in response to supplemental vitamin D3. Fifty-two …

For unknown reasons, the highest incidence of osteoporosis is found in northern Europe. In
these populations, the sunlight exposure is limited and the vitamin A intake is high. The …

Intestinal calcium absorption and the capacity of the intestine to adapt to a low calcium diet
both decrease with age in rats. The purpose of this study was to determine if these …

We evaluated the relationship between plasma concentrations of the renal hormone 1, 25-
(OH) 2-vitamin D and net intestinal absorption of Ca, PO 4, and Mg in vitamin D-replete …

The hypocalcemia that accompanies vitamin D deficiency is a major obstacle to proper
interpretation of the role (s) of vitamin D metabolites in Ca-sensitive tissues. This paper …

To determine whether prior vitamin D intake influences the intestinal calcium absorptive
action of 1, 25-dihydroxyvitamin D3 [1, 25 (OH) 2D3], we measured in vitro the two …

The absorptive response to graded doses of vitamin D3, 25 (OH) D, and 1, 25 (OH) 2D was
measured in healthy adult men after treatment periods of eight, four, and two weeks …