Pregnancy vitamin D showed no clear maternal bone-density advantage
Mothers assigned vitamin D during pregnancy had no statistically clear bone-density advantage over placebo after delivery or years later, despite higher vitamin D levels in late pregnancy.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Vitamin D supplementation increased mothers' blood vitamin D levels in late pregnancy, but did not produce statistically clear differences in bone mineral density compared with placebo after delivery or several years later. Bone mineral density measures mineral content in bone. These results concern mothers' bone density, and do not establish effects on fractures or other health outcomes.
This was a post hoc analysis. The abstract gives no confidence intervals for bone-density differences and reports bone density rather than fractures, leaving small effects and clinical outcomes uncertain.
What researchers found
Maternal bone mineral density
Vitamin D versus placebo at whole-body, spine and left-hip sites, within 2 weeks and around 4 years after delivery; all between-group tests had p > 0.05.
Blood levels and bone measurements
The supplement changed a blood marker of vitamin D status, but that change did not translate into a demonstrated difference in the measured bone-density outcomes. The blood marker and bone scans answer different questions.
What the null finding means
Similar bone-density results were reported at both assessments and in the repeated-measures analysis. A nonsignificant comparison does not prove identical effects, especially when the abstract does not provide confidence intervals for the differences.
The original publication
Pregnancy vitamin D supplementation and bone mineral density of the mother: a post hoc analysis of the MAVIDOS randomised placebo-controlled trial.
Moon RJ, D'Angelo S, Curtis EM et al.
Osteoporos Int · 2025
- PubMed ID
- 40549003
- Record checked
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