# High-Dose Vitamin D Didn't Prevent Fractures in Older Finns With Healthy Levels

*The effect of vitamin D3 supplementation on fracture incidence in an aging population - The Finnish vitamin D trial.*

- **Evidence Level**: Strong
- **Publication Types**: Journal Article
- **Journal**: Bone
- **Sample Size**: 2,495 older adults (men 60+, women 65+)
- **Authors**: Rikkonen T, Hantunen S, Kröger H, Lamberg-Allardt C, Manson JE, Nurmi T, Tuppurainen M, Voutilainen A, Tuomainen TP, Virtanen JK
- **Published**: 2026-09-07
- **Topics**: Vitamin D, Bone Health, Healthy Aging
- **DOI**: https://doi.org/10.1016/j.bone.2026.118081
- **Original Source**: https://pubmed.ncbi.nlm.nih.gov/42704968/

## Summary

Older adults in Finland took either 1600 IU, 3200 IU, or a placebo of vitamin D3 daily for five years. Neither dose lowered the risk of broken bones. Most people in the study already had good vitamin D levels to begin with, which may explain the result. The lower dose group actually had slightly more fractures, though the researchers found no clear reason for it.

## Practical Takeaway

This study suggests extra vitamin D may not protect bones if your levels are already fine.

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