Adequate calcium, as part of a healthful diet along with physical activity, may help reduce the risk osteoporosis later in life. 1 In just one easy to swallow softgel, Nature Made Calcium 600 mg with vitamin D Softgels provides 600 mg of calcium and 400 IU of vitamin D 3. Two softgels provide 1200 mg of calcium for those with a higher recommended daily allowance such as adults 50+.