I was fairly unfamiliar with the Guayusa herb but I heard it can be compared to mate in terms of taste as well as the kick of energy. This tea is fairly sweet think of it as a sweeter mate but with a flavor not nearly as complex. Not that it is a knock against as it is quite nice and refreshing. I drink lots of Mate and Black tea so I don’t really think I’m too caffeine sensitive but damn this tea really got me going. I am more of an earthy guy but I’ll be drinking this one when I have one of those horrific mornings where I wake up with blood shot eyes going through a mild depression when I realize that yes I am this tired and yes I do have a long day ahead of me. Cheers!