A magnesium complex with Vitamin D3 and zinc is a multi-nutrient supplement that typically combines a multi-blend of magnesium (such as citrate, glycinate, malate, and oxide) with cholecalciferol (D3) and zinc. Standard daily doses often provide around 230 mg of magnesium, 1200 IU (30 mcg) of Vitamin D3, and 10.5 mg of zinc split across two daily capsules.