Dietary Supplement Tonalin - For Reducing Body Fat Promotes Reduction of Body Fat & Increased Muscle Retention & Energy Levels Purity & Potency Guaranteed CLA (Conjugated Linoleic Acid) is a naturally occurring form of the essential fatty acid, Linoleic Acid. CLA helps block fat cells from filling up with fat by interfering with a fat-storing enzyme known as lipoprotein lipase. It is also believed to help burn fat by increasing the sensitivity of cells to the hormone insulin, revving up muscle metabolism and helping increase lean muscle mass.