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).
Dark greens and broccoli are also good sources, but to get your daily allowance, you'd have to eat between 6 and 20 cups of them. Finally, if you do opt for a calcium supplement, a reasonable dose would be 500 mg per day in divided doses of calcium citrate, which is more easily absorbed than other forms of calcium.