I used it to detoxify my system after quitting drinking. I'm now throughly addicted to tea. Green tea usually has a lower level of caffine than black tea.
Here's a site to give you info and has a good variety of teas:
http://www.stashtea.com/health.htmHere's a really good green tea that is mixed with berries for enhanced flavor.
http://www.thefragrantleaf.com/redberrysencha.htmlHere are a couple of my favorites:
http://www.thefragrantleaf.com/orgen.htmlhttp://www.thefragrantleaf.com/kuspha.htmlSome people report that they go #2 a lot after drinking green tea, further testifying to it's detoxifying effects.
On edit: I had the bad flu crap a few weeks ago and although I was really sick with it, I didn't have any secondary infections (I took no antibotics) like a lot of people I know. I was too sick to fuss with infusioning whole leaf tea so I drank a lot of Red Rose tea (from bags) with lemon slices.
Since I have begun drinking a lot of tea I have lost weight and feel much better (probably because I gave up drinking alcohol). Although I also drink decaffinated and herbal teas so I don't get too much caffine.