1. People using the key ingredient (C. canephora robusta) for 60 days lost an average of 10.95 lbs. with a low-calorie diet, and 3.7 lbs. in a separate 8-week study with a calorie-reduced diet and moderate exercise. 2. In short-term studies, research shows that caffeine can help temporarily promote increased energy expenditure (calorie burning). 3. Contains caffeine to boost metabolism, enhance focus and increase energy.