Calcium Carbonate IP 1250 mg (From an organic source,oyster shell) Eq. to elemental Calcium 500 mg + Magnesium Hydroxide IP 216 mg Eq. to elemental Magnesium 90 mg + Zinc Sulphate Monohydrate IP 11 mg Eq. to Elemental Zinc 4mg + vitamin D3 IP 200 IU