Microcrystalline Hydroxyapatite (MCHC) is considered a highly biologically available form of calcium because it has been proven to rebuild bone in patients on corticosteroids with existing bone loss. Additionally, in a study of three different sources of calcium, related to healing bone defects, MCHC was the only calcium that resulted in bone healing. These studies indicate that the calcium utilization from MCHC is very high.
Calcium (elemental) 400mg, Vitamin D3 (as cholecalciferol) 120IU. Other Ingredients: Cellulose (Plant Origin), Gelatin, Silica, Vegetable Magnesium stearate.