Extra D. Help reduce the risk of hip fractures by 29% (Based on a clinical study conducted by NIH. When used as directed.). No. 1 doctor recommended (The Os-Cal brand of calcium supplements is the No. 1 Dr. recommended among leading calcium supplement brands.). Extra vitamin D to help optimize calcium absorption. Smooth coating. Now improved with 500 IU vitamin D. Only Os-Cal is proven to help reduce the risk of hip fractures by 29% (Based on a clinical study conducted by NIH. When used as directed.). Osteoporosis - Regular exercise and a healthy diet with enough calcium helps teen, middle-aged and older women and men maintain good bone health. While Caucasian and Asian women are at greatest risk, all middle-aged women, those with a family history of the disease, and older men and women are at risk for developing osteoporosis. Adequate calcium intake is important, but daily intakes above 2000 mg are not likely to provide any additional benefit. Active, healthy lives depend on strong, healthy bones! Os-Cal, helps keep bones strong. Vitamin D. The sunshine vitamin. Why is vitamin D important? According to the National Institutes of Health (NIH): Vitamin D is essential for optimal calcium absorption; Without vitamin D, bones can become thin and brittle; It can be difficult to obtain enough vitamin D from natural food sources and sunlight. Who needs extra vitamin D? According to the NIH, individuals at increased risk of vitamin D deficiency are: Adults (50 years and over); African Americans and others with darker skin; Those with limited exposure to the sun; Those consistently wearing sunscreen SPF 8 or greater. Don't take chances - take Os-Cal.