[christefano]

I second the mate. I love espresso and would drink it all day if I could, but it often leaves me feeling dehydrated.

Mate has mateine, by the way, not caffeine (mateine is a stereoisomer of caffeine). I don't know it has different properties and that's the reason or if it's the plethora of other constituents, but in my experience mate gives me a mild, persistent buzz all over my body as where caffeine goes straight to my head.

[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.