0 sugar per can. Monster Energy Zero Ultra is low in calories. Caffeine From All Sources: 140 mg per can. Some people are impossible to please. As soon as they get what they thought they wanted they always want more. Our team riders and Monster Girls are no different - they've been dropping some hints lately. They've been asking us for a new Monster drink. A little less sweet, lighter-tasting, zero sugar, but with a full load of our Monster energy blend. Sure, white is the new black. We went all out Monster Energy Zero Ultra. Unleash the ultra beast! monsterenergy.com.