Chitosan and garnicia is a fiber that helps to retain fat and is able to fix lipids in the stomach before they reach the intestine and after the bloodstream. On the other hand, HCA is able to increase the activity of the body's calorie-burning enzymes. The combination of the two allows HCA to act on carbohydrates so that they are not transformed into fats, while chitosan is the main impediment to the absorption of excess fatty acids.