Calcium

Studies in people

• Open question

  Heart attack risk³

  Calcium supplements have been linked to a higher risk of heart attack, but calcium from food has not.

How it’s made and used

• Kidney stone risk²

  Not getting enough calcium in your diet may raise the chance of kidney stones forming.

The signal at the top counts the findings in people and in animal and lab studies. A concern in studies of people outranks animal and lab studies, and “No concerns” needs at least one finding in people. When most findings in people point one way, the page leans that way (“Mostly”), and every finding is still shown. Findings whose study type is not stated are shown but not counted. This page is a reference, not medical advice. It describes what regulators and published research say. Talk to a doctor or dietitian about your own diet.