Researchers have investigated the effects of black tea consumption on plasma catechins and markers of oxidative stress and inflammation in patients with coronary artery disease.
According to published research from the U.S., "We previously demonstrated that black tea consumption reverses endothelial dysfunction in patients with coronary artery disease. To investigate potential mechanisms of this effect, we examined plasma catechins and systemic markers of oxidation, inflammation, and antioxidant protection from 66 subjects enrolled in that study."