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6500 IU vitamin D and 1000 mg Calcium daily did not improve bone density – Sept 2011

The effect of high-dose vitamin D on bone mineral density and bone turnover markers in postmenopausal women with low bone mass-a randomized controlled 1-year trial.

Osteoporos Int. 2011 Sep 10.
Grimnes G, Joakimsen R, Figenschau Y, Torjesen PA, Almås B, Jorde R.
Tromsø Endocrine Research Group, Department of Clinical Medicine, University of Tromsø, 9037, Tromsø, Norway, guri.grimnes at unn.no.

Vitamin D is widely used in osteoporosis treatment, although the optimal dose is not known. This 1-year clinical study among 297 women aged 50-80 years old showed that a vitamin D(3) dose of 6,500 IU/day was not better than the standard dose of 800 IU/day in improving bone mineral density (BMD) in the hip and spine.

The purpose of this study was to determine whether a high dose of vitamin D(3) was better than the standard dose in improving BMD and reducing bone turnover in postmenopausal women with reduced bone mass.

The study was a 1-year randomized double-blind controlled trial comparing high-dose vitamin D(3) with the standard dose. Postmenopausal women (n?=?297) with a BMD T-score???-2.0 in either lumbar spine (L2-4) or total hip were included and randomized to 6,500 IU vitamin D(3)/day (20,000 IU twice per week?+?800 IU/day) or 800 IU vitamin D(3)/day (placebo twice per week?+?800 IU/day). Both groups were given 1,000 mg elemental calcium/day. The primary endpoint was a change in BMD in total hip and lumbar spine (L2-4).

After 1 year, serum 25-hydroxyvitamin D (25(OH)D) increased [mean (SD)] from

  • 71 (23) to 185 (34)?nmol/l and from
  • 71 (22) to 89 (17)?nmol/l in the high- and standard-dose vitamin D groups, respectively.

BMD at all measurement sites was unchanged or slightly improved with no significant differences between the groups.
Although bone turnover was reduced in both groups, the more pronounced reduction in serum levels of the bone formation marker P1NP in the standard-dose group may indicate that this treatment was more efficient. Adverse events did not differ between the groups.

One year treatment with 6,500 IU vitamin D(3)/day was not better than 800 IU/day regarding BMD in vitamin D-replete postmenopausal women with reduced bone mass and was less efficient in reducing bone turnover.

PMID: 21909730
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6,500 IU of vitamin D + 1000 mg of Calcium
Resulted in vitamin D in blood 28 ng ==>74 ng but no extra bone density

Wonder if the patients were all drinking soft water (lacking Magnesium)
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See also VitaminDWiki - notice importance of co-factors - such as Magnesium and Vitamin K