What do systematic reviews say?

Intervention not reported

• Oral or parenteral iron supplementation to reduce deferral, iron deficiency and/or anaemia in blood donors 2014 · Cochrane Headline outcomes only
  no estimate extracted
  5 studies · 640 participants
  Moderate

Intervention not reported

• Oral or parenteral iron supplementation to reduce deferral, iron deficiency and/or anaemia in blood donors 2014 · Cochrane Headline outcomes only
  no estimate extracted
  3 studies · 619 participants
  Moderate

Intervention not reported

The intervention probably leads to higher adverse effects (any) (moderate certainty).

• Oral or parenteral iron supplementation to reduce deferral, iron deficiency and/or anaemia in blood donors 2014 · Cochrane Headline outcomes only
  RR 1.6 [1.23, 2.07]
  4 studies · 1748 participants
  Moderate