How are calcium citrate and carbonate different?
Calcium citrate and calcium carbonate are both calcium, but are bound to different substances. Calcium carbonate, the form most commonly found in dietary supplements, requires stomach acid to be optimally digested and absorbed. It is therefore not the best choice for those who have had gastric bypass or people who regularly use medication to suppress stomach acid. Calcium citrate can be digested even by those with little or no stomach acid.