CLA is a polyunsaturated fatty acid that is produced in cows that eat natural grass. It is found in their meat and milk. In recent years, CLA has gained popularity as a dietary supplement due to the plethora of research that suggests it has a role in the regulation of body composition. Tonalin CLA is a patented form of CLA derived from safflower oil, which is naturally rich in the essential fatty acid, linoleic acid. Tonalin CLA is the highest quality form of CLA on the market and has been used in numerous research studies.