You’ve probably heard of yerba mate—it’s that South American tea and coffee substitute that’s only slightly less potent but much gentler on the stomach, and is rife with health benefits. California-based Guayaki uses hand-picked leaves and rainforest-grown mate to produce its all-natural Organic Energy Drinks, which they’ve somehow managed to make taste good. I tried all seven flavors and the only one I didn’t like was the Unsweetened Mate—a bit too bland for me. While it’s no double latté, the stuff did perk me up, and in a more gradual and natural-feeling way. I also noticed the same mental clarity I get from coffee, but it seemed last longer. With Guayaki using fair-trade and sustainable principles, it seems like a no-brainer to switch from Rockstar. Now all we need is some hot mate at the Leaf & Bean, for those cold spring mornings. $2.25; guayaki.com.