If you’re over 50 and taking calcium or vitamin D supplements thinking they protect you from a fracture, science just delivered some bad news: they probably don’t do much.
A Canadian team reviewed 69 randomized trials covering 153,902 participants, published in The BMJ, to answer a question that had been taken for granted for decades: do calcium, vitamin D, or the combination of both actually prevent fractures and falls? The answer, with the largest volume of data analyzed to date, is that none of the three meaningfully reduce risk.
Not hip fractures, not total fractures, not falls. The meta-analysis compared calcium alone, vitamin D alone, the combination of both, and placebo, and in none of the groups did a reduction appear large enough to justify the blanket recommendation many doctors still give as a matter of routine.
This doesn’t mean calcium and vitamin D are useless in general. They remain necessary for other bodily functions, and in people with a diagnosed vitamin D deficiency, correcting it still makes clinical sense for other bone and muscle health reasons. What this study specifically challenges is the idea that taking them as a generic supplement, without a prior deficiency, will prevent a hip fracture if you fall.
Researchers searched the major medical databases (PubMed, Embase, Cochrane Central) for placebo controlled randomized trials, the highest quality evidence possible in clinical research, not observational studies subject to confounding factors.
This is science pumping the brakes on decades of supplement marketing hype. For years, the dominant narrative was that past a certain age, everyone should preventively supplement. With 153,902 participants and randomized trials (the design that best isolates cause and effect, unlike observational studies), that narrative loses empirical support.
The practical takeaway isn’t to stop taking calcium or vitamin D if a doctor prescribed them for another reason, it’s not to expect a magic effect against fractures if there’s no real deficiency behind it. Preventing falls in older adults, according to the accumulated evidence, still comes down to strength and balance exercise, not a pill.
Source: Masse O, Mercurio CM, Dupuis S, et al. “Calcium, vitamin D, or combined supplementation to prevent fractures and falls: systematic review and meta-analysis.” The BMJ, 2026. DOI: 10.1136/bmj-2025-088050.
