Calcium effect is relative, food first milk calcium, food-borne calcium does not meet the calcium needs of available calcium tablets to supplement the shortage. Calcium contained in milk is natural milk calcium, milk calcium in the body does not require the participation of gastric acid can be separated to regulate the balance of blood calcium, while the gastrointestinal tract stimulation is small, there will be no adverse reactions, at the same time, the milk contains a variety of minerals, amino acids and vitamins needed by the human body, to a certain extent, these substances can also promote the digestion and absorption of calcium. Calcium tablets, although the calcium content is relatively high, but its absorption requires the participation of gastric acid, in the stomach to stay for a short time, the human body absorbs less, the gastrointestinal tract stimulation is also relatively large, may affect the body’s normal digestive function. Generally on the basis of insufficient food supplementation and then choose calcium tablets for supplementation.