Carbonated Pre-Workout. Thermogenic: Accelerates Metabolism. Burns Fat. Provides Healthy Energy. 100% of 6 Essential Vitamins. MetaPlus Blend Proven in 6 Published University Studies. How Does It Work? The creators of Celsius have developed a new 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. Turn up the Heat with Celsius clinically proven & proprietary formula, which helps blast fat with 300 mg of caffeine and 2,000 mg of L-Citrulline. Can you handle The Heat?