A similar trial conducted by Rivera et al. studied the effect of 400 mL iron-fortified milk (5.28 mg elemental iron from ferrous gluconate), administered as two 200 mL servings per day for 12 months, on anaemia and ID prevalence in Mexican children aged 12–30 months with mild-to-moderate anaemia (Hb < 11g/dL) [31]. This evidence concerns the gene GSTM1 and anemia.