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).
The synthetic substance known as calcium nitrate is a âdouble salt.â Manufacturers produce calcium nitrate by applying nitric acid to limestone, then treating the substance with ammonia.or this purpose, common calcium formulations include calcium citrate and calcium carbonate. The mineral is also readily available in foods such as milk, milk-based foods like cheese and yogurt, tofu, blackstrap molasses and dark, leafy vegetables.