CXCL8 and sarcoidosis: Moreover, quercetin supplementation also reduced markers of oxidative stress (indicated by plasma MDA levels) and inflammation (measured as plasma ratios of TNF-α /IL-10 and IL-8/IL-10 as pro-inflammatory markers) in the blood of sarcoidosis patients, with the effects appearing to be more pronounced when the levels of the oxidative stress and inflammation markers were higher at baseline.