The answer so far
Calcium is a mineral that gives bones and teeth structure and also helps muscles and nerves work. Food and some fortified drinks can provide it. A supplement is not automatically needed by everyone, and it can interact with medicines.1
What calcium does
Most calcium in the body is in bones and teeth. The body also uses calcium for muscle movement, nerve messages and other functions. Vitamin D helps the body absorb calcium.1
Where it comes from
Milk, yogurt and cheese contain calcium. Other sources include some green vegetables, canned fish eaten with the bones, and foods or plant drinks with calcium added. Check the label: fortification varies between products.1
When supplements need care
Needs vary with age, diet and health. Too much calcium can cause problems, and calcium supplements can interfere with some medicines. If you are considering a supplement or take medicines, ask a healthcare professional or pharmacist about your circumstances.1
Sources
Selected supporting sources; this is not a complete literature review.
- Calcium: consumer fact sheetNIH Office of Dietary Supplements · Government scientific reference