CLA is a remarkable dietary supplement derived from sources like safflower and sunflower oil, and found naturally in grass fed meats and dairy as well as the yolk of an egg. CLA works to reduce body fat by preventing fat accumulation in fat cells. Fat normally enters the fat cell through a door that is controlled by an enzyme that acts as the key. By acting on this enzyme, CLA keeps the door locked. When the door is locked, fat cannot enter the cells and they are prevented from increasing in size. The less fat present in the cells, the smaller and less mature they become. This helps to reduce the level of fat in your body. The increased breakdown of fat helps to fuel and preserve muscle mass, which in turn increases lean muscle mass.