Calcium Beverage Supplement with Magnesium and Vitamin D Calcium Connection is a highly soluble, great tasting powdered drink mix that delivers 500mg of calcium as calcium lactate, 250 mg of magnesium as magnesium citrate and 125 IU of vitamin D. It was designed to dissolve quickly, and be absorbed better than tablets or capsules. * This is an excellent product for those who have a difficulty swallowing pills.