One thing that was a little unfamiliar to me, though, was “Ammonium Ferric Citrate” ― this is an iron-containing acidity ...

Elemental iron (III) (as ferric pyrophosphate citrate) 1.5mg/mL; soln for IV infusion. Triferic contains iron in the form of ferric pyrophosphate citrate. Iron binds to transferrin for transport ...