Background: Vitamin D sufficiency may be determined by the serum concentration of 25-
hydroxyvitamin D [25 (OH) D] that results in maximal intestinal calcium absorption efficiency …

Background: The maximal calcium absorption in response to vitamin D has been proposed
as a biomarker for vitamin D sufficiency. Objective: The objective was to determine whether …

Background: The relative importance of vitamin D metabolites in the regulation of gut
calcium absorption has not been well studied in elderly women living in an environment with …

It is commonly said that vitamin D should be used to increase calcium absorption. We tested
this statement in a dose‐response study of vitamin D on calcium absorption. A total of 198 …

To examine putative sources of interindividual variation in calcium absorption efficiency, we
studied 41 healthy premenopausal women (mean age, 36.4 yr). About half were randomized …

Recent reports of increases in serum 1, 25-dihydroxyvitamin D [1, 25 (OH 2) D]
concentration with aging despite no changes or decreases in calcium absorption suggest …

The exact mechanism for the decrease in intestinal calcium absorption with age is not yet
understood. A decrease with age in serum 1, 25‐dihydroxyvitamin D (1, 25 (OH) 2D) or a …

Vitamin D deficiency, which causes osteomalacia, may also be important in the
pathogenesis of age-related osteoporosis. We studied serum vitamin D metabolites in 52 …

Context: Vitamin D is often recommended for use with calcium supplements to increase
absorption. There are no systematic studies of vitamin D on calcium absorption that indicate …

Bischoff et al.(1) add usefully to the body of information showing the importance of adequate
vitamin D status for the minimization of the risk of falls in the elderly. They attribute their …