Calcium
Calcium is an essential mineral and the most abundant one in the body. Nearly all of it is stored in bones and teeth.
Also listed as Ca2+, Ca, Coral Calcium
What it is studied for
The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.
Why does calcium matter?
Calcium supports bones and teeth, nerve signaling, muscles and blood clotting. When intake stays too low, the body draws calcium from bone. 1
Key studies
The most recent publications linked to Calcium's ratings.
Why people take it
SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.
Questions people ask
Does a normal blood calcium result prove adequate intake?
No. Bone can release calcium and keep blood levels normal despite low intake. 2
Can food cover the requirement?
Yes, DGE considers this possible with calcium-rich foods. 2
Are tablets proven to prevent fractures?
The small bone-density gains in the 2015 review do not establish meaningful fracture prevention. 3
Should several calcium products be combined?
For products supplying over 250 mg daily, BfR recommends avoiding additional calcium supplements. 4
Related nutrients
Phosphorus
Boron
Vitamin D3
PotassiumSources
- Calcium BfR
