Iron(II) citrate
Ferrous citrate, also known as iron citrate or iron citrate, describes coordination complexes containing citrate anions with Fe2+ formed in aqueous solution. Although a number of complexes are possible, only one complex has been crystallized. That complex is the coordination polymer with the formula 2+2.2H2O, where C6H5O73- is HOC2 aquo complexes, such as iron sulfate. Ferrous citrates are all highly unstable in air, converting to ferric citrates.
It is a nutrient supplement approved by the Food and [Drug Administration|FDA].