The purpose of the present work was to study the effect of vitamin D and its metabolites in correcting hypovitaminosis D in the elderly. Thirty elderly people (mean age 78.4 years) participated in this study. They all had low serum levels of 25-hydroxyvitamin D (25-OH-D), of 24,25-dihydroxyvitamin D [24,25(OH)2D] and of 1,25-dihydroxyvitamin D [1,25(OH)2D]. These low levels did not increase in nine subjects after oral administration of vitamin D2 (3,000 IU/day for 12 weeks). However, administration of 1 alpha-hydroxyvitamin D3 (1 alpha-OH-D3) to 12 other subjects (0.5 micrograms/day for 8 weeks) led to a significant increase in the serum levels of 1,25(OH)2D. The other vitamin D metabolite levels remained unchanged. A significant increase in the levels of all three main vitamin D metabolites was obtained following administration of 25-hydroxyvitamin D3 (25-OH-D3) to a third group of nine subjects (25 micrograms/day for 1 week). These results suggest that vitamin D nutrition in elderly people insufficently exposed to the sun could be maintained by regular administration of 25-OH-D, whereas the administration of native vitamin D (ergocalciferol) in the doses used was inadequate for vitamin D nutrition.
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