Calcium lactate is organic calcium, calcium content of 65%, solubility and ionization of the degree of good, the absorption rate of 32%, and no adverse reaction to the intestinal tract. Calcium gluconate is also organic calcium, calcium content of 8.9%, solubility and ionization tea, absorption rate of 27%. Calcium carbonate for inorganic calcium, calcium content of 40%, insoluble in water, small degree of ionization, absorption rate of 32%, due to the need to consume a large amount of gastric acid, so the recommended calcium lactate