Large Review Questions Routine Use of Calcium and Vitamin D Supplements to Prevent Fractures

A large evidence review suggests that routine calcium and vitamin D supplements provide little benefit in preventing fractures or falls for most healthy older adults living independently. The analysis, which included data from 69 clinical trials involving more than 154,000 participants worldwide, found that while taking both supplements together slightly reduced the risk of some fractures, the overall benefit was small.

Calcium and vitamin D supplements have long been promoted as an important way to maintain bone strength and reduce fracture risk with age. However, the findings suggest their protective effects may be more limited than many people expect.

Researchers Reviewed Evidence From 69 Clinical Trials

The researchers analyzed 69 randomized clinical trials involving more than 154,000 adults from around the world. The studies compared calcium supplements, vitamin D supplements, or a combination of both with either a placebo or no treatment, primarily among older adults living independently in the community.

The main objective was to determine whether supplementation reduced the risk of fractures and falls, two of the most important outcomes for older adults and healthcare systems.

Combined Supplements Showed Only Small Benefits

The review found that calcium supplements taken alone produced little or no meaningful reduction in the risk of fractures or falls. Vitamin D on its own showed similar results, even in large studies involving tens of thousands of participants.

Taking calcium and vitamin D together was associated with a modest reduction in some fractures, but the overall effect remained small.

Overall, the researchers estimated that combined supplementation prevented approximately one fracture for every 100 people taking both supplements. Hip fractures were reduced by around three cases per 1,000 people, a difference the researchers considered too small to be clinically meaningful for most individuals.

Based on these findings, the authors concluded that routinely recommending calcium and vitamin D supplements to generally healthy older adults living independently is unlikely to substantially reduce fracture rates or the risk of falls.

Why Fracture Prevention Remains Important

Falls and fractures remain a major public health concern as populations age. Around one in three adults aged 65 years or older experiences at least one fall each year.

Hip and spinal fractures can have serious consequences, including the need for surgery, prolonged hospital stays, loss of independence, and a higher risk of death.

Because of these risks, preventing fractures has remained a major focus of healthcare for older adults, contributing to the widespread use of calcium and vitamin D supplements over many years.

Some People May Still Benefit From Supplements

The researchers emphasize that the findings do not diminish the importance of calcium and vitamin D for overall health. Both nutrients play essential roles in maintaining healthy bones and supporting normal muscle function.

Instead, the review challenges the idea that routine supplementation should be recommended for most healthy adults solely to prevent fractures.

The authors note that supplements may still be appropriate for certain groups, including people with osteoporosis, severe vitamin D deficiency, disorders that impair nutrient absorption, or those taking medications that affect bone health.

The evidence may also differ for frail older adults living in residential care facilities, where vitamin D deficiency is more common because of limited exposure to sunlight.

Lifestyle Measures May Offer Greater Protection

The researchers highlight that lifestyle measures have stronger evidence for protecting bone health and reducing the risk of falls. Regular weight-bearing activities such as walking, climbing stairs, and strength training help preserve both bone density and muscle strength.

Exercises that improve balance, including tai chi and structured physiotherapy programs, have also been shown to lower the risk of falls in older adults.

Maintaining a balanced diet that includes calcium-rich foods, getting safe exposure to sunlight to support natural vitamin D production, and reducing trip hazards at home are also considered important strategies for protecting bone health.

For people at high risk of fractures, prescription medications used to treat osteoporosis may provide greater protection than calcium and vitamin D supplements alone.

The findings add to growing evidence that, for many healthy older adults, maintaining strong bones is likely to depend more on regular physical activity, a nutritious diet, and effective fall prevention than on routine use of calcium and vitamin D supplements.