“Yes, but green tea extracts are commonly in excess, as much as five times the recommended dose. So it is best to drink the tea, not take it in a pill.”
As part of my anti prostate cancer regimen I’ve taken green tea capsules with the EGCG equal to 8-10 cups of tea for about 5 years and my liver and kidney stats are normal. I like supplements because the concentration of the ingredients is standardized and they’re easier than making tea all day. I guess it depends on how “excess” is defined...
As I said originally, different people with different conditions. For you it might be fine and dandy.