GSTM1 and chronic kidney disease: This study included 26 anemic (Hb = 10.23 ± 0.28) CKD patients (stages 3–4) that were given a weekly IVIR (Sodium ferric gluconate, [125 mg/100 ml] for 8 weeks, and during weeks 5–8 also received Carnitine (20 mg/kg, IV) prior to IVIR.