Calcium carbonate is a common supplement for people with low calcium levels. It’s also useful as an antacid to manage uncomfortable digestive symptoms. Calcium carbonate (CaCO3) is a compound ...

Calcium carbonate is best absorbed when taken 500 milligrams or less at a time, so it is recommended to divide the daily dosage. For example, if you take 1,000 milligrams, ...

To get the most out of your calcium, take it in small doses and consider the type of supplement; avoid interactions with other medications and minerals.

On the other hand, calcium carbonate may be associated with gas and bloating, but it’s also more affordable, readily available, and requires fewer tablets per serving to reach your desired dose.

Microbial methane production from calcium carbonate at moderately alkaline pH. Communications Earth & Environment , 2025; 6 (1) DOI: 10.1038/s43247-025-02057-y Cite This Page : ...