The emphasis is on supplements, not green tea itself. Lots of chinese are habitually drinking very strong green tea all day long from one these fancy termos-li

The emphasis is on supplements, not green tea itself. Lots of chinese are habitually drinking very strong green tea all day long from one these fancy termos-like transparent cups (an ages old cultural phenomena, I suppose) and there is no side-effects despite ordinary caffeine overdose. Same is true with coffee. Societies with a coffee-culture, like Turkey or Italy have huge numbers of addicts but uncorrelated number of liver injuries.