ADVANCED CAFFEINE® is a proprietary blend of all natural caffeine sources to keep you switched on by enhancing performance, strengthening endurance and stamina, and delaying the onset of muscle fatigue to power through the toughest workouts. ADVANCED CAFFEINE helps stimulate a surge of adrenaline, increases mental focus, and boosts energy levels. ADVANCED CAFFEINE is not just a great pre-workout boost, it actually helps stimulate calorie burning too.†*