The study was conducted by the University of Lausanne, Switzerland, in collaboration with the Nestlé Research Center. Researchers concluded that three servings per day of a product prototype, Enviga—a sparkling green tea containing a unique blend of green tea extract and caffeine—noticeably increased the amount of energy study participants used without any negative effects on heart rate or blood pressure.
The study looked at 31 healthy men and women, who were non-smokers, at a normal weight, and between the ages of 18 and 35. Study participants were provided with a diet designed to match calorie intake to calorie burning, and were required to drink a serving of Enviga or a placebo beverage three times per day for three days. On the third day, participants were studied in a metabolic chamber under controlled conditions, which included a combination of sedentary activities and light exercise designed to simulate normal everyday activity.