Calcium deficiency when the injection of calcium is also very good, this situation is generally mainly used in calcium deficiency may lead to cardiac dysfunction is more dangerous this situation, for emergency treatment. The main calcium supplement is some oral medication. The best time to take calcium supplements is at night, when calcium ions are present in the blood. At night, the calcium ion level in the blood is lower, and at the same time, the gastrointestinal tract peristalsis is slower, calcium supplementation can effectively promote absorption. When supplementing calcium, do not and iron and zinc at the same time, because their absorption of competition exists. It will affect the absorption of calcium.