GSTM1 and anemia (phenotype): Anemia is a prevalent global health issue characterized by a reduction in the number of circulating red blood cells or a lower‐than‐normal Hb concentration, irrespective of the underlying cause such as red blood cell enzyme deficiency, red blood cell membrane disorders, hemoglobinopathies, or kidney disease, resulting in a diminished oxygen‐carrying capacity of the blood [8, 9].