Millions of Americans swallow calcium and vitamin D tablets every morning hoping to keep their bones strong. A sweeping new review of the evidence suggests that habit does very little for most people.
The systematic review and meta-analysis, published in The BMJ in May 2026, pooled 69 randomized controlled trials and 153,902 adults. It concluded that calcium alone, vitamin D alone, or the two combined offer little to no clinically meaningful reduction in fractures or falls for most older people.
The Canadian team, led by pharmacist Olivier Massé of Sacred Heart Hospital of Montreal, set a threshold for what counts as a real-world benefit before looking at the numbers. Almost nothing crossed it.
What the numbers actually showed
Calcium on its own was tested in 11 trials with 9,067 participants and showed no meaningful effect on fractures. Vitamin D on its own, tested in 36 trials with 92,045 participants, came out the same. The combined pill, studied in 15 trials with 51,126 participants, produced only a small dent.
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According to the analysis, combining the two lowered any fracture by roughly one case per 100 people over the study periods, and hip fractures by about three per 1,000. The researchers judged both effects too small to matter for a typical independent older adult.
Follow-up in the trials averaged just over two years, and the findings held across age, sex, and prior fracture history.
Who might still benefit
The review does not close the book for everyone. In a linked commentary, Guylène Thériault of the University of Montreal pointed out that the trials do not settle the question for people with confirmed vitamin D deficiency, a previous fracture, or those living in nursing homes.
Earlier trials in frail nursing home residents with poor vitamin D status did show clear reductions in hip and other fractures, and clinical guidance has long singled that group out. People with osteoporosis or on bone-active medication were also outside the scope of the new review.
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The practical takeaway is simple. Anyone taking these supplements on a doctor's advice, or because of a diagnosed condition, should talk to their physician before stopping.
What the researchers say does work
Instead of a daily pill, the linked editorial pointed to interventions that repeatedly beat placebo in fall and fracture trials. Balance training, resistance exercise, and multi-part programs that combine exercise with a home hazard check and personalized education were highlighted as the strongest tools.
That shift matters for a country where falls remain a leading cause of injury in older adults. The review's authors argue that clinicians, guideline writers, and regulators should re-examine blanket recommendations to supplement, and redirect attention toward exercise-based prevention that has held up better in trials.
Calcium and vitamin D are still essential nutrients, and the review does not dispute that. It challenges only the belief that a supplement bottle is doing meaningful work in the bones of an otherwise healthy adult.
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