Our Calcium Carbonate 600 Mg With Vitamin D3 800 Iu Product Comes In A Bottle Of 100 Tablets, Each Providing 220 Mg Of Elemental Calcium And 800 Iu (20 Mcg) Of Vitamin D3 As Cholecalciferol. These Ingredients Are Essential For The Formation And Maintenance Of Strong Bones And Teeth. The Combination Of Calcium And Vitamin D3 Can Help Improve Bone Density.