Readers looking for stronger bones gain a clearer picture of what calcium and vitamin D supplements can and cannot do, after a sweeping review of 153,902 adults found little to no meaningful protection against fractures or falls in most older people. The findings, published in The BMJ, point toward balance and resistance exercise as strategies with stronger evidence behind them.
What the review covered
Researchers in Canada pooled results from 69 randomized controlled trials. The trials compared calcium supplements, vitamin D supplements, and the two combined against either a placebo or no treatment. The combined sample of 153,902 adults is among the largest assembled for this question. The team rated the certainty of the evidence using established research methods and set thresholds in advance for what would count as a clinically meaningful benefit.
What the evidence showed
Across the studies, supplementation did not meaningfully reduce fracture risk.
- Calcium alone: moderate certainty evidence from 11 trials with 9,067 participants.
- Vitamin D alone: high certainty evidence from 36 trials with 92,045 participants.
- Calcium and vitamin D together: high certainty evidence from 15 trials with 51,126 participants.
The same pattern held when the researchers looked at hip fractures and at falls specifically. Calcium, vitamin D, and the combination each showed little to no effect, with most of the underlying evidence rated moderate to high certainty.
Who the findings apply to
The results stayed broadly consistent when the researchers accounted for age, sex, previous fractures, previous falls, and average calcium intake from food. That consistency strengthens confidence in the headline conclusion for the general older adult population.
Where the evidence is thinner
Some parts of the analysis drew on small numbers of trials or participants, which means individual subgroup results should be read with care. People with specific bone disorders or those taking medication for osteoporosis have different clinical needs and should not assume these averages apply directly to them.
Why routine supplementation is being questioned
Calcium is a major structural component of bone, and vitamin D helps the body absorb calcium and supports normal bone metabolism. Earlier reviews had already cast doubt on taking either one alone for fracture prevention, with mixed results when the two were combined. Despite those open questions, vitamin D, with or without calcium, is still commonly recommended by clinicians, guidelines, and regulatory bodies for bone health, and prescriptions have risen in recent years. The authors of the new review argue that routine supplementation to prevent fractures and falls is not supported by the current evidence and that guideline panels and regulators should reassess their general recommendations.
What does work for falls and fractures
Falls remain a major concern with age. Nearly one in three adults aged 65 and older falls each year, and falls can lead to fractures, chronic pain, loss of independence, and in some cases a move into residential care. The linked editorial authors point toward approaches with stronger evidence behind them.
- Balance training and resistance exercise to improve strength and stability.
- Multicomponent programs that pair exercise with hazard assessment and tailored education.
Larger, adequately powered trials are needed to determine whether supplementation benefits high-risk populations.
FAQ
Do calcium and vitamin D supplements prevent fractures in older adults?
Across 69 randomized trials covering 153,902 adults, calcium, vitamin D, and the combination each showed little to no meaningful reduction in fractures. The evidence for vitamin D alone and for the combination was rated high certainty.
Do calcium and vitamin D supplements help prevent falls?
No. The review found little to no effect of supplementation on falls, with most evidence rated moderate to high certainty.
Who should keep taking these supplements?
People with specific bone disorders or those receiving medication for osteoporosis may have different clinical needs and should not assume the review’s averages apply to them. Treatment decisions for those groups belong with a clinician.
