What do systematic reviews say?

Any supplements containing iron and folic acid vs same supplements without iron nor folic acid (no iron nor folic acid or placebo)

(Maternal outcomes) Any supplements containing iron and folic acid probably leads to higher side effects (any reported throughout the intervention period) (ALL) compared with same supplements without iron nor folic acid (no iron nor folic acid… (moderate certainty).

• Daily oral iron supplementation during pregnancy 2015 · Cochrane Headline outcomes only
  RR 44.32 [2.77, 709.09]
  1 study · 456 participants
  Moderate