The calcium and vitamin D supplements millions of older Australians take may not be doing what you think

If you take a daily calcium or vitamin D supplement to protect your bones and prevent falls, you are in very good company. Millions of older Australians do the same, following advice that has been standard medical guidance for decades.

New research published in the BMJ – one of the world’s most respected medical journals – suggests it may be time to reconsider.

A major review of 69 clinical trials involving more than 153,000 adults has found that calcium supplements, vitamin D supplements and the combination of both offer little to no clinically meaningful benefit in reducing fractures or falls in most older people.

What the research found

The Canadian research team analysed trials covering all three supplementation approaches and reached broadly consistent conclusions across all of them.

For calcium supplements alone, there was little to no effect on fractures, based on moderate quality evidence from 11 trials involving more than 9,000 participants. For vitamin D supplements alone, the finding was the same – little to no effect – based on high quality evidence from 36 trials covering more than 92,000 participants. For the combination of calcium and vitamin D together, the result was again little to no meaningful effect, based on high quality evidence from 15 trials involving more than 51,000 participants.

The review also looked at specific fracture types, including hip fractures – the most serious and debilitating type in older adults – and found the same pattern. Falls were also no less frequent in those taking supplements compared to those taking a placebo or nothing at all.

The researchers were careful to note the limitations of their work. Some analyses covered smaller numbers of participants. The findings may not apply to people with specific bone disorders, or to those already taking prescription medication for osteoporosis. And the trials themselves varied in quality.

But after accounting for differences including participant age, sex, history of fractures and falls, and dietary calcium intake, the conclusions held firm. The researchers’ summary was clear: these findings “do not support routine supplementation with calcium or vitamin D, or combined supplementation to prevent fractures and falls.”

Why this matters

Falls are a serious public health issue in Australia. Almost one in three people aged 65 and over falls each year, and when fractures result – particularly hip fractures – the consequences can include prolonged pain, loss of independence, and in some cases a permanent move into residential care.

The desire to prevent that outcome is entirely understandable, which is why calcium and vitamin D recommendations have been so widely followed. Prescriptions for both have increased substantially in recent years, and supplement sales in Australia reflect the same trend.

The concern raised by this research is not that people have been doing something harmful – both nutrients remain important for overall health – but that the specific expectation of fracture and fall prevention may not be justified by the evidence.

What actually does work

The research points clearly toward what the evidence does support.

A linked editorial in the BMJ suggests that focus and funding should be redirected toward interventions that have been shown to meaningfully reduce falls and fractures. These include balance and resistance exercise, home hazard assessment and modification, and programs that combine multiple approaches tailored to individual risk.

In plain terms: staying strong and stable through regular physical activity is considerably better supported by evidence than taking a daily supplement.

Balance exercises such as tai chi, yoga and targeted physiotherapy programs have all been shown in robust trials to reduce fall rates in older adults. Strength training that builds muscle around the hips and legs provides physical protection that supplements simply cannot replicate.

What should you do?

The most important thing is not to make any changes to your supplement routine without talking to your GP first.

If you have been prescribed calcium or vitamin D by a doctor – particularly if you have a diagnosed bone condition, osteoporosis, or are already on treatment for bone loss – this research does not necessarily apply to your situation. The review specifically notes that its conclusions may not extend to higher-risk groups.

What the research does suggest is that the automatic recommendation to take these supplements as a general preventive measure for all older adults deserves reconsideration. If you are taking them without a specific clinical reason, that is a conversation worth having with your doctor at your next visit.

In the meantime, the prescription that has the strongest evidence behind it remains the same as it has always been: keep moving, stay strong, and make your home as fall-safe as possible.