Calcium ions are types of mineral that is particularly easy to accumulate, because the intestinal tract has limited absorption of calcium. If we take too much calcium at a time, the body cannot absorb it, it will accumulate in the small intestine, large intestine or rectum, which affect intestinal peristalsis. Calcium is excreted from the kidneys, so it absorbs a lot of intestinal water and excrete as urine. If we take too much calcium tablets without drinking water, the water in the intestines will decrease, peristalsis will slow down, and results in constipation. It is recommended to consume natural source of high-calcium foods and drink plenty of water to reduce the risk of calcium accumulation in the body and improve constipation.