A new report is warning that people who take calcium supplements could be increasing their risk of having a heart attack.
The pills are often taken to strengthen bones and prevent fractures. But the report published in the journal Heart found those taking the supplement were twice as likely to have a heart attack compared to not taking the supplement.
What is unclear is if the same holds true for calcium found in foods.
Some experts already say a balanced diet including calcium might be a better strategy.
The British Heart Foundation says patients prescribed calcium should keep taking their medication and speak to their doctor if they are concerned.