Blackmores Cal-d Calcium 600mg + Vitamin D3 500 Iu Is A High Dose Calcium Supplement Providing 600mg Of Elemental Calcium With 500 Iu Of Vitamin D3 In An Easy-to-swallow Tablet. Vitamin D3 Works With The Absorption Of Calcium To Improve Bone Mineral Density Which Also Helps To Build Stronger Bones....