Green Coffee Extract contains high levels of active compounds called "chlorogenic acids", and one in particular called "5-caffeoylquinic acid". These chlorogenic acids work by suppressing the amount of glucose that is absorbed in the small intestine. Glucose is used for energy, so if the body cannot use glucose, it turns to other sources, such as fat. The idea is that it helps you to burn more fat by restricting the absorption of glucose. It is advised that to achieve maximum benefit from this supplement, you take it with your daily meal containing the highest levels of glucose.