Calcium carbonate,the most widely used

These salts during the digestion in the stomach, consume large amounts of stomach acid, or the presence of varying degrees of side effects. Sodium lactate in advertising that calcium derived from animal bones, shells or pearl powder organisms have biological activity, which is unscientific. Because these organisms bones and shells, potassium lactate in the form of salts, can not have a real biological activity. The advantage of the first generation product is cheap, convenient reclaimer. Drawback is mainly due to salt, the solubility is poor and requires a lot of acid decomposition of the calcium ions can be absorbed. Calcium carbonate because they are safe, cheap and in such a widely used calcium preparations.