What is Calcium citrate and explain in detail?
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.   Calcium citrate is also found in some dietary calcium supplements (e.g. Citracal or Caltrate). Calcium makes up 24.1% of calcium citrate (anhydrous) and 21.1% of calcium citrate (tetrahydrate) by mass