Conjugated Linoleic Acid (CLA) is an essential fatty acid. Research indicates that CLA may promote muscle tone and produce a decrease in fat accumulation at fairly low dosages without any major effects on food intake. As well as helping to maintain a healthy "fat to lean body mass ratio", CLA may also help to build a healthy immune system and maintain healthy cholesterol levels. Tonalin is a naturally rich source of conjugated linoleic acid derived from safflower oil.