Taking calcium supplements is to prevent and treat osteoporosis. Osteoporosis is a condition where bones become weak and are more prone to fractures, especially common in older adults. Calcium is a crucial component for bone health; it helps maintain bone density and strength. If your body lacks calcium, your bones can become fragile and more likely to break. Additionally, vitamin D is important because it helps your body absorb calcium. Therefore, proper calcium and vitamin D supplementation can effectively prevent osteoporosis and maintain healthy bones.