before understanding these two kinds of calcium, we need to understand the absorption of calcium first. Calcium is absorbed in the small intestine, which involves many different factors. It is impossible for the small intestine to completely absorb calcium, and different types of calcium supplements also have an impact on the amount absorbed. In addition, the acidity of the small intestine, the level of vitamin D and estrogen in the body also affect the absorption. The side effects of calcium supplements are also related to the above-mentioned factors. Let's look at the comparison between calcium carbonate and calcium citrate.

compared with calcium citrate, calcium carbonate is not only cheap, but also easy to obtain.

the natural calcium concentration in calcium carbonate is higher, so a small amount of tablets can meet daily needs. Comparatively speaking, you need to take more calcium citrate to get your daily needs because it contains less natural calcium.

The absorption of calcium carbonate requires more gastric acid because it is alkaline. Therefore, it is recommended to take it after meals, or take it with orange juice and lemon juice (how to make an acidic drink). This does not apply to calcium citrate, because it is easily absorbed.

calcium carbonate can cause side effects such as indigestion and flatulence, while calcium citrate can have adverse effects such as headache and constipation. People with allergies may have allergic reactions to both forms of calcium.

the uses of calcium carbonate and calcium citrate are the same, and users can choose one according to their actual situation. Always remember to take calcium supplements in strict accordance with the recommended dosage, because excessive intake may cause health problems.