What is the mechanism of glutathione reductase when reducing oxidized glutathione? Quora Simplify your Glutathione Measurements Arbor Assays Heinz bodies are small clumps of damaged hemoglobin found inside red blood cells. They form due to oxidative stress and are often seen in conditions like G6PD deficiency. Their presence can indicate Response of Human Red Blood Cells to Acute and Chronic Oxidant Challenge as Observed Through the Glutathione and Glutathionyl Hemoglobin Redox Pairs In Vitro and In Vivo