The correct question is:
What is calcium?
What is iron?
What is niacin?
- Calcium is a mineral. It helps build and repair bones and helps build teeth. Milk
and other dairy products are good sources of calcium.
- Iron is a mineral also, but it doesn't build teeth or bones. It helps carry oxygen to
all your body's cells.
- Niacin is a vitamin, not a mineral. It promotes healthy skin and nerves. You get
niacin from foods in the meat/protein and grain groups.