Calcium carbonate D3 tablets should not be taken for a long time, because calcium carbonate D3 tablets have high calcium content and vitamin D3 content, and long-term intake of calcium ions and vitamin D3 can lead to hypercalcemia and vitamin D3 buildup. Hypercalcemia can lead to many undesirable symptoms such as headache, anorexia, constipation, nausea, urinary tract stones, lower back and back pain, and can even lead to the formation of multiple calcified foci throughout the body. In addition, long-term accumulation of vitamin D3 can lead to vitamin D3 toxicity, which can even lead to increased blood pressure, bradycardia, ECG ST segment changes, and in severe cases, kidney failure, so calcium carbonate D3 tablets should not be taken for a long time.