Although G6PD deficiency, which can cause problems in red blood cells upon certain triggers, is the most common human enzyme defect, affecting over 400 million people, including over 1 in 10 Black Glucose 6 phosphate Dehydrogenase (G6PD) Deficiency Concise Medical Knowledge L glutamine for sickle cell disease: more than reducing redox Annals of Hematology Springer Nature Link Oxidative Stress in Healthy and Pathological Red Blood Cells