As you grow, you need calcium and other minerals and vitamin D to build strong bones and a healthy body.

Calcium is a mineral that many parts of your body need. Its main job is to build strong bones and teeth, which contain 99% of your body’s calcium. Calcium also helps your muscles move and helps control your blood pressure.

If you don’t get enough calcium, your bones will weaken. This is because your body will take calcium from your bones to meet its needs.

When you are young, your body can store calcium in your bones. As you age, you lose the ability to store calcium in your bones. By the time you reach young adulthood, your bones reach their peak bone density. That means your bones are as dense (or packed) with calcium as they will get—for life. Then your body mainly withdraws calcium from what is stored...

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