* Dietary Supplement * Compare to Active Ingredients in OS Cal 500 + D * Extra Vitamin D (D3) * Helps Build Bone Mass in Young Adults and Helps Prevent Bone Loss in Later Years Regular exercise and a healthy diet with enough calcium helps teen and young adult Caucasian and Asian women maintain good bone health and may reduce their high risk of osteoporosis later in life. Adequate calcium intake is important, but daily intakes above about 2,000 mg are not likely to provide any additional benefit. Now with extra Vitamin D. Vitamin D is essential for use of calcium and necessary for healthy bones, teeth and cartilage.