Vitamin D and Increased Bone Mineral Density

Research synthesisLow evidenceSmall effect5 studies · 3 beneficial · 2 neutral · 0 harmful

Across 5 studies, 3 reported beneficial effects on bone mineral density (predominantly small effect size), while 2 found no effect. The highest-quality study (randomized controlled trial, n=222) reported no significant benefit. Study durations and doses varied widely, with no consistent range identified.

Caveats: The highest-quality evidence (RCT in children, meta-analysis in bariatric patients) does not support a benefit, while beneficial findings originate from lower-quality reviews and a small clinical trial in thalassemic children. Study durations were seldom reported, and no specific form of vitamin D was consistently studied.

Generated Jul 11, 2026

Doses used in studies

IU/day: 1,000–7,943 (median 3,735.75, IQR 2,000–6,207.25) — 2 studies
mcg/day: 5 (median 5, IQR 5–5) — 1 study

Time to effect

Median: 12.2 months · IQR 12.2 months–12.2 months · Range 12.2 months–12.2 months — Reported in 1 of 5 studies

Safety in these studies

adverse eventsReported
The trial reported no adverse events in the moderate-dose vitamin D arm, but did not provide any information on adverse events in the placebo arm.
from: Oral vitamin D supplementation for adults with obesity undergoing bariatric surgery.

5 of 5 papersPopulation:

Vitamin D supplementation during pregnancy and offspring bone microarchitecture: A post hoc analysis of the MAVIDOS randomised controlled trial.
- 2026-06
- RCT · n = 222
- Bone 207
- - Charlotte Maden
  - Stefania D'Angelo
  - Leo D Westbury
  - Elizabeth M Curtis
  - Sarah R Crozier
  - Keith M Godfrey
  - Kate A Ward
  - Cyrus Cooper
  - Nicholas C Harvey
  - Rebecca J Moon
- PubMed: 41802552
- DOI: 10.1016/j.bone.2026.117843
9 Insights on
- Increased Bone Mineral Density
- High evidence
- Large Human Trial
- Children
No significant differences in cross-sectional area, cortical thickness or porosity, trabecular thickness or number, or volumetric BMD (total, cortical or trabecular) were found using linear regression
Effect
Neutral
Effect size
Small
Significant
No
Dose
1000 IU/day
Oral vitamin D supplementation for adults with obesity undergoing bariatric surgery.
- 2024-10-01
- Meta-Analysis · n = 314
- The Cochrane database of systematic reviews 2024(10)
- - Marlene T Chakhtoura
  - Nancy F Nakhoul
  - Elie A Akl
  - Bassem Y Safadi
  - Christos S Mantzoros
  - Maria-Inti Metzendorf
  - Ghada El-Hajj Fuleihan
- PubMed: 39351881
- DOI: 10.1002/14651858.cd011800.pub2
4 Insights on
- Increased Bone Mineral Density
- High evidence
- Clinical
High-dose vitamin D may have little to no effect on ... bone mineral density at the lumbar spine, hip, and forearm, but the evidence is very uncertain.
Effect
Neutral
Effect size
Small
Significant
No
Dose
high-dose (5000-7943 IU/day) vs moderate-dose (800-2000 IU/day)
Effect of vitamin D-fortified foods on bone health and osteoporosis: a scoping review and future policies focusing on the United Arab Emirates.
- 2025-09-22
- Systematic Review · n = 14
- Archives of osteoporosis 20(1)
- - Sehar Iqbal
  - Maya Abuajlan
  - Amira Alktheri
  - Zoha Imtiaz Malik
  - Abdul Momin Rizwan Ahmad
  - Taima Qudah
  - Suhad Abumweis
- PubMed: 40982112
- DOI: 10.1007/s11657-025-01611-7
3 Insights on
- Increased Bone Mineral Density
- High evidence
Evidence from most of the studies (n=9) indicates that regular consumption of vitamin D-fortified foods improves serum 25(OH)D levels, enhances bone mineral density, and lowers the risk of fractures.
Effect
Beneficial
Effect size
Small
Significant
Yes
The efficacy of vitamin K2 and calcitriol combination on thalassemic osteopathy.
- 2013-11
- Clinical Trial
- Journal of pediatric hematology/oncology 35(8)
- - Mehmet A Ozdemir
  - Kenan Yilmaz
  - Ummuhan Abdulrezzak
  - Sebahattin Muhtaroglu
  - Turkan Patiroglu
  - Musa Karakukcu
  - Ekrem Unal
- PubMed: 24136015
- DOI: 10.1097/mph.0000000000000040
2 Insights on
- Increased Bone Mineral Density
- Moderate evidence
- Clinical
We detected a significant improvement in the bone mineral density and Z-score at the lumbar spine area of the patients at the sixth and 12th month of the treatment
Effect
Beneficial
Effect size
Moderate
Significant
Yes
Dose
5 mcg/day
Cholecalciferol (vitamin D3): efficacy, safety, and implications in public health.
- 2025-06-09
- Review
- Frontiers in nutrition 12
- - Esteban Ortiz-Prado
  - Jorge Vasconez-Gonzalez
  - Juan S Izquierdo-Condoy
  - Isaac A Suárez-Sangucho
  - José Guillermo Prieto-Marín
  - Karen Bereniss Villarreal-Burbano
  - Mateo Alejandro Barriga-Collantes
  - John Alexander Altamirano-Castillo
  - Domenic Anahi Borja-Mendoza
  - Jean Carlo Pazmiño-Almeida
  - María Paz Cadena-Padilla
- PubMed: 40551736
- DOI: 10.3389/fnut.2025.1579957
7 Insights on
- Increased Bone Mineral Density
- Low evidence
High-dose vitamin D₃ has demonstrated benefits in specific populations, including improved bone mineral density, immune homeostasis, glycemic control, and reduced inflammation.
Effect
Beneficial
Effect size
Small
Significant
Yes

Vitamin D and Increased Bone Mineral Density

Vitamin D supplementation during pregnancy and offspring bone microarchitecture: A post hoc analysis of the MAVIDOS randomised controlled trial.

Oral vitamin D supplementation for adults with obesity undergoing bariatric surgery.

Effect of vitamin D-fortified foods on bone health and osteoporosis: a scoping review and future policies focusing on the United Arab Emirates.

The efficacy of vitamin K2 and calcitriol combination on thalassemic osteopathy.

Cholecalciferol (vitamin D3): efficacy, safety, and implications in public health.