CLA, or conjugated linoleic acid, is a free fatty acid that comes from the essential unsaturated fatty acid linoleic acid. Natural Factors Tonalin CLA provides the highest quality CLA available. Tonalin is proprietary blend of CLA with multiple clinical trials attesting to its effectiveness and safety. CLA works in several ways to promote effective weight loss. It helps block fat cells in the body from filling up by interfering with fat-storing enzymes. It also increases the sensitivity of cells to insulin, which encourages them to turn glucose into energy rather than storing it as fat. CLA helps burn fat by revving up muscle metabolism and increasing lean muscle mass. The more muscle the body has, the more calories it is capable of using, speeding up the fat burning process. Ultimate Phytoslim Tonalin® CLA is an excellent aid to permanent healthy weight loss, especially when combined with diet and exercise. It is sourced from environmentally sustainable natural safflower oil and highly purified. Each softgel provides 1000 mg of Tonalin’s proprietary CLA blend.