Nitrous technology. Don't let the skinny can fool you, Monster Energy Extra Strength packs a full load of our tried & true energy blend! Call us crazy but we supercharged our Monster Energy base then injected it with nitrous oxide for a unique texture, smooth drinkable flavor and buzz that's big as ever. Unleashed the nitro beast! www.monsterenergy.com. Facebook. Instagram. Twitter. YouTube. Caffeine from All Sources: 160 mg per can.