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This really makes me wonder if matcha powder poses a similar danger. Apparently it has 137 times the amount of EGCG compared to regular green tea

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Interesting thought. Matcha is powdered whole tea leaves, so one would be consuming far more of the internal ingredients of the leaf than they would by having other green teas, where the leaves are just being steeped in water.

I guess the only questions there would be how concentrated Matcha is compared to the supplement forms and how much the body would absorb from it in this form. If the resulting dose is still a fraction of the supplement form, then it's likely safe if one doesn't drink a ton of it.

Thanks for mentioning this though, as a tea drinker I've been considering getting some matcha, and now I need to research more before I do

You are probably safe if you drink about as much Matcha as people who regularly drink Matcha. That is a cup or two a day. Drinking Matcha is supposed to be a ritualistic action, its preparation takes a bit of time and it should be drunk in a mindful manner. It's not a drink where you prepare a large amount and drink it throughout the day.

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