One cup of green tea contains approx. 200mg of flavonoids. Studies indicate having three cups a day over 2 weeks increases flavonoid levels in the blood by 25%. While we now know that green tea is very healthy, more evidence is needed to understand how much green tea one must consume to really derive complete health benefits. This is because no two human beings are alike, and each one needs different levels of antioxidants depending on lifestyle, dietary habits, exposure to environmental factors like pollution, etc. All that can be said with some degree of confidence is that green tea is healthy!