Pharma nord bio calcium and d3 and k 500mg 60 tablets calcium d3 k is a combination supplement that contains a high percentage of elemental calcium in an easily absorbed form calcium and vitamin d are needed for the maintenance of normal bone in adults as well as for the growth of bone in children a sufficient daily intake of calcium is important in older adults particularly women around the menopause as well as in young people to build up strong bones at an early age and counteract the