“…Adverse gastrointestinal symptoms and the secondary outcomes of interest were reported by fewer studies. Adverse effects were only reported in four studies; 28,35,37,42 hemoglobin levels were assessed in 13 studies; 26,28–32,35,36,38,39,41,43,46 serum ferritin was assessed in five studies; 28,30,32,41,44 hematocrit was assessed in two studies; 39,46 and only one study each assessed plasma folate, 45 serum transferrin, 28 erythrocyte protoporphyrin concentration, 41 total iron binding capacity, 30 urinary iodine concentration, 40 and low birth weight 39 (Tables 2 and 3).…”