A calcium supplement for strong bones. Key Benefits Provides a concentrated source of calcium to build strong bones. Includes vitamin D and magnesium for better calcium absorption and utilization. Taking a calcium supplement daily, in addition to a healthy diet and regular weight-bearing exercise, may reduce the risk of osteoporosis by slowing the rate of bone loss. Usage For enhanced bone protection, use Xtra-Cal® with Herbalife's soy-protein containing shakes.