Some doctors think it's possible that taking calcium supplements may increase your risk of a heart attack. Other doctors believe that calcium supplements have little or no effect on your heart attack risk.
Many people take calcium supplements to treat or prevent bone disease, such as osteoporosis. It's thought that the calcium in these supplements could make its way into fatty plaques in your arteries — a condition called atherosclerosis — causing those plaques to harden and increase your risk of heart disease.
A 2013 study from the National Institutes of Health suggests there is an increased risk of heart attack, stroke or other cardiovascular diseases from taking calcium supplements for men only. Other studies suggest there is an increased risk for both men and women.
More research is needed before doctors know the effect calcium supplements may have on your heart attack risk. The calcium supplements that some doctors are concerned about are generally those that contain only calcium. However, more research is also needed to determine the effects of supplements combining calcium and vitamin D. Calcium from food sources, such as dairy and green leafy vegetables, is not a concern.
Current recommendations for getting enough calcium for people who have, or have risk factors for, osteoporosis haven't changed. As with any health issue, it's important to talk to your doctor to determine what's most appropriate in your case.