According to published research from Japan, "Epidemiologic studies suggest that tea consumption decreases the risk for cardiovascular events. However, there has been no clinical report examining the effects of tea consumption on coronary circulation."
"The purpose of this study was to evaluate the effects of black tea on CFVR using transthoracic Doppler echocardiography (TTDE). This was a double-blind crossover study of 10 healthy male volunteers conducted to compare the effects of black tea and caffeine on coronary circulation," wrote K. Hirata and colleagues, Osaka City University, School of Medicine.