Red blood cells as intelligent antioxidant carriers to rescue sperm in in vitro fertilization (IVF): A hypothesis ScienceDirect G 6 PD The Disorder 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 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