Chondroitin calcium is mainly used to protect cartilage and joint health. For osteoporosis, calcium and vitamin D are more commonly recommended supplements. Osteoporosis is a condition that makes bones weak and more prone to fractures. Increasing calcium and vitamin D intake, along with regular exercise, can help prevent and manage osteoporosis. While chondroitin calcium is beneficial for cartilage, its direct effect on osteoporosis may be limited.