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).
Sources of calcium. Calcium needs to be obtained from the diet as it is not manufactured by the body. The main sources of calcium in the diet are milk, dairy products and other calcium-rich foods such as fish with edible bones (e.g sardines and anchovies), beans, tofu, spinach, watercress and broccoli.