Conjugated Linoleic Acid (CLA) is a recently discovered free-fatty acid that may prove to be essential to our diet. Studies show that CLA may play a vital role in reducing body fat and improving muscle tone. Scientists have repeatedly demonstrated the effects of this essential supplement on muscle tone and body fat. Researchers at the University of Wisconsin have shown CLA to play a role in shutting calories towards muscle and away from body fat. This process is known as repartitioning. HDT uses Tonalin brand CLA.