The like of roobois, yerbal mate (I think)and herbal/flower teas have
no caffeine. I have no comments about their favor because I haven't
tried them.

It's also important to look at theanine, caffeine and catechins in
aggregate, they cancel out each other.

I agree with Lewis It IS a complicated subject. Here are some
thoughts:

http://www.amazing-green-tea.com/gre...-caffeine.html

Julian
http://www.amazing-green-tea.com