[rms]

http://en.wikipedia.org/wiki/Yerba_mate#Chemical_composition...

It's the other alkaloids that contribute to the effects that are different than coffee.

[christefano]

It's great seeing erowid as a cited source. Thanks for the info.

[rms]

I hadn't followed it through to the source when I posted the Wikipedia link. That was a pretty cool little paper one of the mysterious admins of erowid wrote.