From the perspective of the body’s intake, absorption and regulation of calcium, the best time to take calcium tablets is every night before going to bed, because many of the foods eaten every day contain calcium, such as milk, lean meat, and shellfish such as fish, shrimp and crab, and you can take a lot of calcium from each meal. If taken after meals, there are two disadvantages: 1, it will cause the waste of calcium; 2, calcium is also easy to mix with other foods, affecting the absorption of calcium, and serious cases will produce the symptoms of constipation, so it is not suitable to eat calcium tablets after three meals. And before bedtime is generally fasting, no longer eat, but calcium is still excreted from urine, so the blood calcium level is very low at night, the most suitable is to take calcium tablets before bedtime. Calcium tablets can be taken together with rice and noodles, because rice and noodles contain very low calcium and will not affect the absorption of calcium, but some foods, such as milk, are best not taken together with calcium.