I hope that you are driking green tea from Japan harvested and packaged prior to 3-11-2011. Ito en’s green tea come from the areas where affected by Fukushima Daiichi Nuclear plant accident. They also has packaging facilities located north of Tokyo. It has been repeatedly reported in Japanese news that they are finding much higher level of radiation in tea leaves ever since then.
As soon as I learned about it, I ran to Costco to buy several boxes manufactured prior to March 2011 to last at least a couple of year while I can find replacements. I hope people who make a purchase decision are aware of the fact.