What do systematic reviews say?

Intravenous iron vs oral iron

Intravenous iron showed no clear difference in anaphylaxis or evidence of hypersensitivity Clinical assessment compared with oral iron (low certainty).

• Treatment for women with postpartum iron deficiency anaemia 2015 · Cochrane Headline outcomes only
  RR 2.78 [0.31, 24.92]
  8 studies · 1454 participants
  Low

Intravenous iron with oral iron vs oral iron

• Treatment for women with postpartum iron deficiency anaemia 2015 · Cochrane Headline outcomes only
  no estimate extracted
  0 studies · 1 participants
  Low