Calcium Citrate
Vitamins & MineralsCAS: 813-94-5
This is what the ingredient is.
Calcium citrate is a calcium salt of citric acid, well-absorbed even without food.
Here is why it shows up on the label.
Used for calcium fortification and supplementation. Better absorbed than calcium carbonate on empty stomach.
Here is what food agencies say.
The FDA lists it as Generally Recognized as Safe. European food agencies allow it. Widely permitted for fortification.
Here is what research has found.
Good bioavailability independent of stomach acid. Preferred for those with low stomach acid.
Here are a few things worth knowing.
Generally safe. May interact with certain antibiotics and medications. Follow recommended doses.
Sources
- FDA GRAS List
- EFSA Scientific Opinion
- NIH Calcium Fact Sheet
How to read this page
We publish plain facts about this ingredient so a label is easier to read. This is not medical advice, and it is not a recommendation to buy, avoid, or use anything. For a personal health question, talk with a clinician who knows your history.
v1.0Updated 9/12/2026