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).
Potassium magnesium citrate is available over the counter. It is proving to be very beneficial in preventing kidney stones. Potassium citrate (such as K-Lyte, Polycitra-K, and Urocit-K) is given as the only treatment to people with normal urine calcium levels.