Earlier quoted context omitted.
They mentioned that since the green tea was consumed from a long time it is clasified as food, so nobody is forced to test for side effects, dosage or effectiveness. Other issues could be caused if the plant supplement contains also different plants, there could be similar plants that the plant collectors could slip in(by mistake or not) (I mean in general I do not know how the green tea is collected) , or the plants…
> As an example my son when he was young he liked carrot juice, so give it to him daily, when we went to the doctor she noticed he had is skin colored and told us to stop, I had no idea that too much carrots can be bad Well in your son’s case, it’s not harmful per se according to Wikipedia, Carotenosis is harmless - you will just look orange. https://en.wikipedia.org/wiki/Carotenosis
Vitamin A is a classic: Too little, and you get blind and your feet start bleeding when you walk. Too much, and you get blind and your feet start bleeding when you walk.