Calcium and Vitamin D Supplements Did Little to Prevent Fractures and Falls

CATEGORY: FOODS & NUTRIENTS

Vitamin D pills taken on their own did nothing about broken bones. That null result was rated at the highest level of certainty, in a pooled analysis of 69 randomized trials covering 153,902 adults. Calcium and vitamin D taken together did trim overall fracture risk by about 9%, but the reviewers judged the difference too small to support routine supplement use in generally healthy adults.¹

The Default Bone Advice for Half a Century

Calcium is the mineral that gives bone its hardness. Vitamin D, the nutrient your skin makes in sunlight, is what helps your gut absorb that calcium. The two work as a team, which is why taking them in pill form has been standard bone-protection guidance for decades. They are among the world’s most used supplements. The new review, published in BMJ by a team led by Montreal pharmacist Olivier Massé, tested that guidance where it counts: in the number of bones people actually break. It largely does not hold up, the authors concluded, and they wrote that clinicians and health agencies should re-evaluate their general recommendations.¹

Counting Broken Bones in a Small City’s Worth of People

The review pooled 69 randomized trials. In each, people were allocated by lot to calcium, vitamin D, both, or a placebo, so the groups began on equal footing and any difference at the end can be credited to the pills. Together the trials covered 153,902 adults, roughly the population of a mid-sized city. Most participants (87%) lived at home rather than in care facilities, and nearly three-quarters carried no raised risk of breaking a bone. Follow-up averaged about two to three years. Fractures and falls were counted as they actually happened, not read off bone-density scans as a stand-in.¹

Nine Percent Overall, Sixteen for Hips, Still Under the Bar

Vitamin D alone was tested in 36 trials covering 92,045 people. It left fracture rates exactly where they were. The evidence was rated high certainty. Calcium alone showed about a 9% dip, but that result was not statistically clear. The combination did better, with 9% fewer fractures overall and 16% fewer hip fractures, differences unlikely to be chance. Even those reductions fell short of the threshold the review had set for a benefit large enough to matter to one person, and falls were essentially unchanged under all three strategies. Statistically real, too small to feel. That is what this very large body of evidence produced. The review is also explicit about who it does not describe. People with osteoporosis (the disease of weakened, fracture-prone bones), people taking bone-strengthening medications, and people with diagnosed vitamin D deficiency all sit outside its scope, and supplementation remains a separate question for them. Care-home residents and other high-risk groups lacked the data to judge. Within its scope the finding held steady across age, sex, fracture history and dietary calcium intake. Earlier evidence pointed the same way: in 2018 the US Preventive Services Task Force found the evidence did not support low-dose supplementation for preventing fractures in community-dwelling adults.²

Key Takeaways

• Vitamin D supplements alone had no effect on fractures across 69 randomized trials in 153,902 adults, a high-certainty result, and calcium alone showed no clear benefit.
• Calcium and vitamin D together were linked to 9% fewer fractures overall and 16% fewer hip fractures, reductions the reviewers judged too small to support routine supplementation in generally healthy adults.
• The findings leave out people with osteoporosis, people on bone medications and people with vitamin D deficiency, and the data were too thin to judge care-home residents and other high-risk groups.

References

1. Massé O, Mercurio CM, Dupuis S, et al. Calcium, vitamin D, or combined supplementation to prevent fractures and falls: systematic review and meta-analysis. BMJ. 2026;393:e088050. link
2. US Preventive Services Task Force; Grossman DC, Curry SJ, Owens DK, et al. Vitamin D, Calcium, or Combined Supplementation for the Primary Prevention of Fractures in Community-Dwelling Adults: US Preventive Services Task Force Recommendation Statement. JAMA. 2018;319(15):1592–1599. link