Yerba. What the hell, right? I heard about it years ago, but there was nobody in the US selling it, and it was expensive as hell to import from Argentina or Uruguay. Then a little while back I came across this massive thread at bodybuilding.com and found that a dude in Georgia was importing it and selling it on his site : http://www.yerbamatecafe.biz So I finally ordered some Yerba along with a traditional Mate (the gourd) and bombilla (the straw). Wow. I've replaced coffee and cigarettes with this stuff and have never felt better in my life. It's an acquired taste, but the "Salante" brand, which has a lower stem content, roasted almonds to mellow the taste, Stevia leaves (a natural calorie free sweetner) and additional natural flavoring is very, very easy to get used to, especially with a little Splenda in it. Very strange stuff. Really hot water burns it and makes it bitter, you start the steeping with cold water, then add sub-boiling water to it as you drink it. Lasts a long time.... the small gourd I have going right now, I made this morning and I'm on my second thermos of hot water going through it... you just sip, sip, sip, refill and repeat, no need to change the leaves. It's not caffeine free, but has a very low content... but that doesn't mean it doesn't have a kick. It really, really... REALLY does. Very clean energy boost. Mild MAO Inhibitor effect as well, which is where the mood enhancing comes from I think. A few gourds of this, and I'm in a great mood, with great energy, and a real desire to DO stuff. The wife and I have about 10 different flavors in the cupboard now. I still don't care for the traditional stuff... very strong heavy flavor, but with more of a kick. Highly recommend for people who like trying new things. I'm wild about this stuff. Sippin' on an Elderberry flavored one now.