I don't know where the idea that Mayo "suggests 2 cups per day" of green tea comes from. Two cups are just a nice refreshing drink--it will do nothing for CLL. A healthy diet is always wise and perhaps green tea is a part of that. As a participant in the green tea study in 2008-09, I can tell you that the maximum dosage was 2 grams twice per day. In my case the dosage was reduced numerous times due to elevated liver enzymes. Eventually I got down to the minimum dose of 400 mg twice per day, and then taken off the study when it still affected liver enzymes. EGCG is NOT a harmless supplement. Be careful if you're taking it without close monitoring. As for the conclusion of the study (which didn't get to Phase III), this is a quote from Dr. Neil Kay, one of the principal investigators of the study: “Without a phase III clinical trial, we cannot make a recommendation that EGCG be used by CLL patients, but those who want to take supplements should consult with their oncologists and need to receive appropriate monitoring using laboratory tests.” Note: I was diagnosed in 2006, and have been a Mayo patient since 2007, currently on a clinical trial BTK inhibitor and doing fine. I don't drink green tea (unless it happens to be an occasional glass) or take EGCG and never would.