The potential link between inherited G6PD deficiency, oxidative stress, and vitamin D deficiency and the racial inequities in mortality associated with COVID 19 ScienceDirect The Multiple Roles of Glucose 6 Phosphate Dehydrogenase in Tumorigenesis and Cancer Chemoresistance G6PD Deficiency causes Haemolytic Anaemia Glucose 6 phosphate dehydrogenase is an enzyme in the hexose monophosphate shunt that synthesizes NADPH. The NADPH is used to convert oxidized glutathione (GSSG) to reduced glutathione ( G6pd glucose6phosphate dehydrogenase pathway vector illustration graphic Premium Vector