Word Origin & History. critical 1580s, censorious, from critic + -al (1). Meaning pertaining to criticism is from 1741; medical sense is from c.1600; meaning of the nature of a crisis is from 1640s; that of crucial is from 1841.
Calcium citrate is the calcium salt of citric acid. It is commonly used as a food additive (E333), usually as a preservative, but sometimes for flavor.In this sense, it is similar to sodium citrate.alcium citrate is also found in some dietary calcium supplements (e.g. Citracal).
Calcium citrate is highly soluble and bioavailable forms (they are chelates) of these minerals that have much greater absorption rates than other common forms of calcium and magnesium supplements (and low interaction levels with other minerals as compared to other common forms of these supplements).