"Real" Green Tea?

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I have been drinking a lot of green tea, partly because it is supposed to be good for me and partly  because I really like it.  I make a pot and put it in the fridge and drink it all day long.  

My question is, how beneficial is the stuff in the tea bags?  I am currently using Tetley's decaffeinated tea bags but wonder if I should find a source of green tea leaves instead.  Do you think there is any value in the tea bags?

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