Four different forms of calcium are used in the Reacted Calcium formula to maximize absorption in the body.
1-2 capsules three times per day or as recommended by your health care professional 

Serving Size: 2 Capsules

Amount Per Serving
Vitamin D3 … 10 mcg (400 IU)
(as Cholecalciferol)
Calcium ... 500 mg
(as Calcium Hydroxyapatite, DimaCal® Dicalcium Malate, TRAACS® Calcium Bisglycinate Chelate, Calcium Citrate USP)
Phosphorus ... 143 mg
(as Calcium Hydroxyapatite)

Other Ingredients: Natural Vegetable Capsules, Microcrystalline Cellulose, Magnesium Stearate, and Silicon Dioxide.