GSTM1 and anemia (phenotype): The intervention increased Hb concentration (0.22 g/dL; 95% CI: 0.00, 0.44 g/dL) and reduced anemia by 7.1 pp, with greater MNP consumption and anemia declines among children aged 12–18 (8.6 pp) compared to children aged 6–11 mo.