There are more types of calcium tablets, clinically common calcium carbonate D3 tablets, calcium Vitamin D2 lactate tablets, calcium gluconate tablets, etc., may produce belching, constipation, hypercalcemia and other side effects. 1. Calcium carbonate D3 tablets: mainly used for calcium supplements for pregnant and lactating women, menopausal women, the elderly, etc., and to help prevent and control osteoporosis, may produce belching, constipation and other side effects, overdose can occur hypercalcemia, the use of which should be noted that hypercalcemia, hyperuricemia, calcium-containing kidney stones or history of renal calculi are prohibited. 2. Calcium Vitamin D2 Lactate Tablets: mainly used for children, pregnant women, lactating women calcium supplementation, may produce constipation and other side effects, hypercalcemia, hyperuricemia, calcium-containing kidney stones or those with a history of kidney stones are prohibited. 3. Calcium Gluconate Tablets: mainly used for the prevention and treatment of osteoporosis, tetany, bone dysplasia and other calcium deficiencies, may produce constipation and other side effects, hypercalcemia, hypercalciuria patients are prohibited. It is recommended to choose suitable calcium tablets for calcium supplementation under the guidance of doctor, so as to avoid oversupplementation of calcium causing hypercalcemia, loss of appetite, nausea, constipation, etc., which will have an impact on your health.