Monster Energy Lo-Carb Energy Drink, 16 Ounce Two 10-packs of 16oz cans; 20 cans total Lo-carb energy drink with low calories, but no compromise. Thirst-quenching flavor with the Monster Energy blend in a low calorie, low sugar energy drink Monster Energy's proprietary energy blend has the ideal combo of the right ingredients in the right proportion to deliver just the right kick. 15 calories per serving