“… epicatechin are potent inhibitors of H₂O₂ production by mitochondria from both tissues (IC₅₀ approximately 1-2 μM), even when H₂O₂ production rate …. Although the rate of oxygen consumption was unaffected by concentrations up to 10 μM of these flavonoids, quercetin, kaempferol and apigenin inhibited complex I … than 20% inhibition.”