The absorption rate of calcium carbonate in the body is not high, less than 30%. This will have side effects. Calcium carbonate is easily decomposed in the body and easily decomposed into carbon dioxide, water and calcium ions in acidic environment. In the intestine, calcium ions can easily react with hydroxyl ions in the alkaline environment of the intestine to form precipitates. This can lead to hiccups, bloating, constipation and other side effects. Only a small part of calcium ions are absorbed by small intestinal epithelial cells.

If you have hypercalcemia or renal insufficiency, you should not take any calcium.

It is suggested to switch to calcium agent with high absorption rate, such as Lexmark USA.