The main function of calcium tablets is to provide calcium to the body, you need to choose the regular channels to buy, follow the doctor’s instructions to use the right dose of calcium tablets. 1. Formal channels: the purchase of channels must go to a formal hospital or pharmacy, check the approval number, in order to prevent the purchase of fake and shoddy products, adverse reactions or pharmaceutical substandard situation. 2. Appropriate dosage: the most common on the market today is calcium carbonate D₃ granules, which have the highest calcium content, while others include calcium gluconate tablets and calcium lactate tablets. Some calcium tablets contain a smaller amount of calcium, which cannot meet the normal body needs, and are generally not recommended. Calcium tablets need to be used under a doctor’s supervision to ensure effectiveness and safety. If nausea or intolerance occurs after taking calcium tablets, you need to change to other calcium tablets as prescribed by your doctor. Calcium tablets are usually consumed after meals, which reduces oxalate intake and the risk of urinary stones.