Calcium D is mainly calcium carbonate and vitamin D3, many patients will be constipated after taking it, it is recommended to adjust the method of taking it appropriately, because calcium carbonate needs stomach acid to dissociate, it is recommended to take it at the best time in the meal, during the meal, immediately after the meal. After the meal, there is a large amount of gastric acid to help dissociate calcium carbonate for better absorption. At the same time, taking it with a meal can also reduce gastrointestinal stimulation and reduce and diminish constipation. In addition, if constipation still occurs, it is recommended to first develop the habit of regular bowel movements. Go to the toilet at the right time to cultivate bowel movements even though you have no bowel movement. Eat more foods rich in dietary fiber, such as various whole grains, like corn, millet, barley, buckwheat, and oats. Like various legumes, such as red beans, soybeans, mung beans and roots and tubers, like sweet potatoes, yams, potatoes, rich dietary fiber can help soften stools and can help with bowel movements. Should eat more fresh vegetables, fresh vegetables are also rich in dietary fiber, also help defecation. You should also adopt a scientific lifestyle, reasonable and balanced nutrition, moderate exercise, stop smoking and limiting alcohol, regular sleep, and psychological balance, all of which can help treat constipation.