What is upper safe amount of green tea ?

Why the overload of green tea?
What are you hoping to benefit from this?

Tea is high in fluoride, and drinking that much can put you over the safe limit of fluoride, since it can cause health issues. More on that here: https://www.rdhmag.com/patient-care/patient-education/article/14033922/hidden-fluoride-in-tea-and-other-foods-and-beverages

If you do drink a lot of it, i'd get organically grown tea, since most teas are grown in countries with lower standards with regards to pesticide usage. More on that here - https://www.cbc.ca/news/canada/pesticide-traces-in-some-tea-exceed-allowable-limits-1.2564624

saynow111 wrote: »

adidastyle wrote: »

The safe daily rate of a natural caffeine stimulant is 1000 mg, and the recommended single dose is up to 400 mg. In each variety of green tea, as well as depending on the brewing technology and water temperature, the amount of caffeine varies, however, the average value in 1 cup is about 40-70 mg. Based on this, you can drink up to 12 cups of green tea per day, but it is recommended to stay at 4-8.

What many gm of green tea leaves do you mean ?
These 12 cups ?

The problem with this question is you don't actually eat the green tea... how much would be used depends on how strong you like your tea and how much you use to brew the tea. The amount used is too variable to give a direct answer to the question.

The OP is making the mistake of thinking if some is good, then tons must be better. It doesn't work that way. Whatever the ideal amount of tea is must be WAAAAY less than the maximum safe amount. Drink a reasonable amount.

Someone else mentioned fluoride, here's a story from several years ago that I remembered reading. Note that while it's rare in the US a doctor in here states that he recognized it as not as rare in India.
https://www.cbsnews.com/news/womans-150-tea-bag-per-day-habit-lead-to-bone-disease-her-doctors-say/