When choosing the right calcium supplement for yourself, first look at the calcium content. Adults need about 1000 mg of calcium per day, so pay attention to the content per tablet. Secondly, consider the type of calcium. Common ones are calcium carbonate and calcium citrate. Calcium carbonate should be taken after meals, while calcium citrate does not have this requirement. For those with low stomach acid or stomach discomfort, calcium citrate may be more suitable. Finally, check if the calcium supplement contains vitamin D, as vitamin D helps with calcium absorption. It's best to consult a doctor and choose based on your health condition and needs.