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What are the side effects of calcium?

Side effects of calcium supplements include gas, bloating and constipation. To minimize these side effects, take no more than 500 milligrams (mg) of calcium at a time, and take it with a meal. If that doesn’t help, try a different form of calcium supplement (calcium carbonate seems more likely to cause problems than calcium citrate) or a different brand.  

Some studies have suggested that calcium supplements can raise your risk for kidney stones. The evidence isn't clear, but to protect yourself, don't get more than 2,500 mg per day from food and supplements combined.

Some controversial research has suggested that suddenly increasing the amount of calcium you get from supplements can raise your risk of cardiovascular disease. However, more study is needed to know if that danger is real.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.