Calcium carbonate should not be taken for a long time because it is a calcium supplement and as a medicine it has side effects and adverse reactions. Before taking calcium supplements, it is important to see if it is suitable for calcium supplements, such as children or women who are breastfeeding, and elderly people with osteoporosis, etc. Calcium supplements can be appropriate in such groups. But if there are no symptoms, no disease, no indications, as a relatively young young adults is not necessary to supplement calcium, can be completely from food to supplement calcium, drink more milk or eat more food with high calcium content. But if there is a real need for calcium, you should also follow the course of treatment to take calcium carbonate. If you take more than the course of treatment, it can produce belching, constipation, even hypercalcemia, or kidney stones, as well as alkalosis and other diseases. In severe cases, it may even affect the nerves and muscles, manifesting as indifferent expression or weakness. In case of advanced kidney damage, kidney failure may even occur. Therefore, any drug should not be taken orally for a long period of time, but should be taken orally according to the instructions or as prescribed by the doctor.