Calcium is the most abundant mineral in the human body and is crucial for the health of bones and teeth. Most of the calcium is stored in bones and teeth, helping them stay strong during growth and development. The amount of calcium needed varies by age and gender; for instance, children aged 1-3 need 700 mg daily, while adults aged 19-50 need 1000 mg daily. Calcium is important not only for bone health but also for heart, muscle, and nerve functions. The best sources of calcium are foods like milk, cheese, and yogurt. Non-dairy sources like calcium-fortified orange juice, tofu, and leafy greens are also rich in calcium. If you can't get enough calcium from food, you may take supplements as per your doctor's advice.