What are the differences between calcium carbonate and calcium citrate?
Calcium carbonate is the most common and cost-effective form, containing about 40% calcium by weight, but it requires adequate gastric acid for absorption and is best taken with food. In contrast, calcium citrate contains approximately 21% calcium, does not require gastric acid for absorption, and is better absorbed when taken on an empty stomach, making it preferable for individuals on PPIs or the elderly.
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