Nu-Health's BioCalcium is also available in capsule form which contains high potency elemental calcium derived from Coral Calcium and Calcium Citrate, which are some of the most bioavailable sources available. Coral Calcium is a salt of calcium derived from fossilized coral reefs. It contains magnesium and trace minerals. BioCalcium also contains Calcium Citrate, which is oftentimes considered a preferred source of calcium due to its ability to be absorbed with low levels of stomach acid. Overall, it is important to supplement with calcium because it is a mineral that is essential for human life and helps to promote the bodily absorption of other nutrients.