Bone Reports (Jun 2015)

Effect of vitamin D3-supplementation on bone markers (serum P1NP and CTX): A randomized, double blinded, placebo controlled trial among healthy immigrants living in Norway

  • Ahmed A. Madar,
  • Kirsten V. Knutsen,
  • Lars C. Stene,
  • Mette Brekke,
  • Per Lagerløv,
  • Haakon E. Meyer,
  • Helen M. Macdonald

DOI
https://doi.org/10.1016/j.bonr.2015.05.004
Journal volume & issue
Vol. 2, no. C
pp. 82 – 88

Abstract

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Objective: Vitamin D is essential for the maintenance of calcium homeostasis and bone mineralization; and low serum 25-hydroxyvitamin D (s-25-(OH)D) concentrations are associated with increased bone turnover. However, there is a lack of randomized controlled trials that have investigated the effect of vitamin D treatment on bone turnover in immigrant populations. We aimed to investigate the effect of 16-week daily vitamin D3 supplementation on bone formation marker serum procollagen type 1 amino-terminal propeptide (P1NP) and bone resorption marker C-terminal crosslinked telopeptide of type I collagen (CTX). Design: Double-blind, randomized, placebo-controlled trial. Setting: Immigrant community centers in Oslo, Norway. Participants: 251 healthy adults aged 18–50 years with a non-Western immigrant background were recruited. Intervention: 16 weeks of daily oral supplementation with either 10 μg vitamin D3, 25 μg vitamin D3, or placebo. Main outcome measures: Difference in change during the 16-week intervention between the intervention groups combined (10 or 25 μg of vitamin D3/day) and placebo, in serum P1NP and serum CTX. Results: A total of 214 (85%) participants completed the study. S-25-(OH)D increased from 29 nmol/L at baseline to 49 nmol/L in the intervention group with no significant change in the placebo group. However, there was no difference in change of serum P1NP (mean difference: −1.2 μg/L (95% CI: −5.4, 2.9, P = 0.6)) and serum CTX (mean difference: −0.005 μg/L (95% CI: −0.03, 0.02, P = 0.7)) between those receiving vitamin D3 supplementation compared with placebo. The plasma PTH had decreased by a mean of −1.97 pmol/L (95% CI: −2.7, −1.3, P < 0.0001) in the vitamin D3 group compared to placebo. Conclusions: Supplementation with 10 or 25 μg oral vitamin D3 during winter and spring for 16 weeks did not significantly affect serum P1NP and serum CTX, despite increasing s-25(OH)D and decreasing PTH in a healthy immigrant population with low baseline vitamin D status. Trial registration number: NCT01263288.

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