Calcium is the essential element for the formation of bones. It is a key component of bone tissue and plays a crucial role in maintaining bone density and strength. Alongside phosphorus, calcium forms hydroxyapatite, the mineral that gives bones their rigidity. A sufficient intake of calcium is vital during childhood, adolescence, and throughout adulthood to support growth and overall skeletal health. Dietary sources of calcium include dairy products, leafy greens, nuts, and fortified foods. If calcium intake is inadequate, it can lead to weakened bones or conditions such as osteoporosis, emphasizing the importance of adequate nutrition for bone health.