Lo-CarbMonster EnergyTear into a can of the meanest energy supplement on the planet,. Lo-Carb MONSTER energy. We went down to the lab and performed major surgery on the Monster. We hacked out carbohydrates and calories, transplanted the wicked Buzz and dialed in the flavor. Lo-Carb MONSTER energy still delivers twice the Buzz of a regular Energy drink, but only has a fraction of the calories.