Green tea contains antioxidants of the polyphenol family of 30% to 40%. Previous studies suggest that these antioxidant compounds exert beneficial effects on parameters of cardiovascular health. Onakpoya, from the University of Oxford (United Kingdom), and colleagues who completed a meta-analysis of published randomized controlled trials, involving a total of subjects of 1,536, of green tea and its polyphenol constituents. The researchers found that green tea consumption associated with a lower average systolic blood pressure. In addition, green tea consumption correlated to lower total and LDL cholesterol levels.