As you all may know. Green tea has many medical benefits. Many teas are not always as “clean” as one wants them to be.
Recently, ConsumerLab examined different forms of green tea and one of the best ones was found to be: Joe’s Organic Green Tea 20 Bags/box (Pack of 4) https://www.amazon.com/Trader-Joes-Organic-Green-Bags/dp/B0042LI0GY
So if you want to benefit from green tea, you may want to search for this particular brand.

Green tea should be brewed for just a short time [1 to 3 minutes]

 It is recommended to use water around 80°C to 85°C (176°F to 185°F) for most green teas, as boiling water can scorch the leaves and result in a bitter taste.