Carbonated Pre-Workout. Thermogenic: Accelerates Metabolism. Burns Fat. Provides Healthy Energy. 100% of 7 Essential Vitamins. MetaPlus Blend Proven in 6 Published University Studies. How Does It Work? The creators of Celsius have developed a new carbonated, pre-workout drink for the athlete who wants to take it to the next degree. Heat turns on thermogenesis, a process that boosts your body's metabolic rate. Turning up the Heat with clinically proven Celsius' proprietary MetaPlus formula, blasts fat with 300 mg of caffeine for extreme energy. Celsius Heat's great tasting carbonated formula with 2,000 mg of added citrulline is also designed to deliver the additional ingredients you deserve from your pre-workout drink.