Three forms of Calcium are intended to provide maximum nutritive support for bone health. 500 mg of Magnesium is the widely popular 2:1 ratio for Calcium to Magnesium. 100% of RDI of Vitamin D is added for more efficient Calcium ultization. Zinc and copper are added to help ensure adequate absorption of the essential minerals.Ingredients: Nutrition Facts Serving Size: 4Capsules Amount per Serving Potency % Daily Value Vitamin C(as Ascorbic Acid) 40 mg 67% Vitamin D(as Cholecalciferol) (D-3) 400 IU 100% Vitamin K(Phylloquinone) 1000 mcg 1250% Calcium(as Calcium Carbonate, Citrate, Malate) 1000 mg 100% Magnesium(as Magnesium Oxide, Citrate) 500 mg 125% Zinc(as Zinc Picolinate) 15 mg 100% Copper(as Copper Gluconate) 1 mg 50% Manganese(as Manganese Gluconate) 5 mg 250% Betaine HCl 40 mg Bamboo(Bambusa vulgaris)(stem extract) Supplying 21 mg [70%] organic silica) 30 mg Boron(as Boron Citrate) 100 mcg Other Ingredients: Gelatin (Capsule), Cellulose, Magnesium Stearate, Acacia and Maltodextrin.