Guayaki introduced its same-named Sparkling Yerba Mate beverages, which can help stimulate focus and clarity as well as boost physical energy, the company says. Available in cola-flavored Classic Gold, Cranberry Pomegranate and Grapefruit Ginger varieties, the drinks are lightly carbonated. They also are U.S. Department of Agriculture-certified organic and Fair Trade certified. The 45-calorie Grapefruit Ginger variety is sweetened with stevia and agave nectar. A 12-ounce can retails for approximately $1.99.