Our Best Selling Flavor! Feel good about replacing your jittery pre-workouts and your acidic 3 o'clock pick-me-ups with CLEAN Cause Yerba Mate. No secret formulas, all simple organic ingredients. Our bestselling Blackberry Organic Sparkling Yerba Maté takes the tart fruit flavor of blackberries and sweetens it with sugar and stevia. With only 60 calories per can and 160 MG of caffeine, you’ll get the boost to refocus and keep doing what you love most.