Raspberry ketone is a natural phenolic compound of the red raspberry. The chemical structure of raspberry ketone is similar to the structures of capsaicin and synephrine, compounds known to exert promote the metabolism and breakdown of body fat. Likewise, raspberry ketone has been shown to promote fat metabolism. Raspberry Ketone Benefits: Help lose weight and keep it off. Supports fat metabolism. Helps promote the release of fat from fat cells. May help reduce the accumulation of new fat in fat cells.