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White oval pills spilling out of a medicine bottle to illustrate calcium supplements.

White oval pills spilling out of a medicine bottle to illustrate calcium supplements.
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Are calcium supplements dangerous?

Blog post | 15 Oct 2018

Nearly half of Australians are not getting their recommended dietary intake of calcium, which may put many people—the elderly, in particular—at risk of osteoporosis and fractures.

Calcium is a mineral that is essential to healthy, strong bones. It's found naturally mostly in dairy foods, tofu and seafood. Most adults need a total of 1,000mg of calcium per day, increasing to 1,300mg for women aged over 50 and men over 70 years.

Doctors sometimes prescribe calcium supplements to ensure patients get enough calcium every day. But there have been reports of people stopping taking calcium, believing the supplements can increase the risk of heart disease, kidney stones and stomach upsets.

But before you stop taking a calcium supplement, read this.

What the research actually says

If you need extra calcium, taking 500mg to 600mg of supplements per day is considered safe and effective, says Professor Mark Cooper, an endocrinologist and Deputy Chair of the Medical and Scientific Committee at Healthy Bones Australia.

The question of whether calcium supplements increase the risk of heart attacks or strokes arises from studies that combined data from lots of smaller studies—where doses of calcium [supplements] were, on average, well above 600mg,” explains Professor Cooper. “Some researchers found a small increase in these risks, but others have not.”

If you have been recommended a supplement by your doctor and the intake is 500mg to 600mg per day, consumers should continue to take the supplement, as directed. 

Some studies have reported a small increase in kidney stones among people taking calcium supplements. “The risk of this happening is very low. But calcium supplements should be used cautiously in people with a history of a kidney stone or some other kidney problems,” says Professor Cooper.

Take calcium if you need it

As always, before you start taking—or stop taking—any supplement, discuss it with your doctor first. Calcium supplements are usually only recommended for people who do not get enough calcium from their diet and who may be at risk of falls and fractures.

It’s always best to get your calcium intake from calcium-rich foods if you can. While there’s no test that reliably diagnoses a low-calcium diet, you can calculate your daily intake using the table here.

Have you already been prescribed calcium? Keep taking it. “If you have been recommended a supplement by your doctor and the intake is 500mg to 600mg per day, consumers should continue to take the supplement, as directed,” says Professor Cooper.

How to get more calcium in your diet 

Think ‘food first’, and look for foods that have calcium added (‘calcium-fortified’). Here are some top sources of calcium:


  • Reduced-fat milk fortified with calcium – 520mg per 250ml serve
  • Low-fat natural yoghurt – 488mg per 200g tub
  • Regular milk – 304mg per 250ml serve
  • Reduced-fat cheddar cheese – 209mg per 21g slice
  • Cheesecake – 163mg per 125g slice 


  • Sardines, canned in water – 486mg per 90g can
  • Pink salmon, canned in water – 279mg per 90g can
  • Red salmon, canned in water – 203mg per 90g can
  • Mussels, steamed or boiled – 173mg per 100g
  • Snapper, grilled with olive oil – 163mg per 100g fillet

Vegetables, fruit and pulses

  • Tofu, firm – 832mg per 250ml cup
  • Reduced-fat soy milk – 367mg per 250ml cup
  • Dried figs – 160mg per 6 figs
  • Soy beans, canned – 106mg per 200g cup
  • Chickpeas, canned – 90mg per 200g cup 

Where to get more information 

If you’d like to get an idea of your risk of osteoporosis, take the quick self-assessment at Know Your Bones, an initiative of Healthy Bones Australia and the Garvan Institute of Medical Research. See your doctor if you’re concerned about the results.   

Ask your doctor about your bone health and whether it would be a good idea for you to have a bone mineral density test. If so, you may qualify to be reimbursed under the Medicare Benefits Scheme. It’s a quick and painless body scan that measures the density of your bones. Low density can increase the risk of fractures.

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