What do systematic reviews say?

Intervention not reported

The intervention probably leads to lower low Hb deferral ‐ at first donation visit after commencement of… (moderate certainty).

• Oral or parenteral iron supplementation to reduce deferral, iron deficiency and/or anaemia in blood donors 2014 · Cochrane Headline outcomes only
  RR 0.34 [0.21, 0.55]
  4 studies · 1194 participants
  Moderate