Bones may seem solid and unchanging, but they are living tissue that is constantly renewed. Calcium is one of the key minerals involved in this process and plays an important role in supporting bone health. Most of the body’s calcium is stored in the bones and teeth. A smaller amount circulates in the blood, where it supports muscle contraction, nerve signalling, and heart rhythm. When blood calcium levels are low, the body may draw calcium from bone stores to maintain balanc