The function of calcium in the human body is primarily to build and maintain strong bones and teeth. It is essential for proper bone development, mineralization, and structural integrity. Additionally, calcium plays a crucial role in muscle contractions, nerve function, and blood clotting. Adequate calcium intake is important throughout life, particularly during childhood and adolescence when bone growth occurs. Low calcium levels can lead to osteoporosis and increase fracture risk later in life. Therefore, ensuring sufficient dietary calcium through foods or supplements is crucial for overall health.