CLA stands for conjugated linoleic acid. CLA is an naturally occurring fatty acid found in our diet and since the body cannot produce this fatty acid it can be obtained only through the diet. CLA is found in ruminant animals and food products from ruminant animals such as meat, cheese and dairy products.
CLA is produced from LA (Linoleic Acid) and has a rearrangement of its molecular structure, resulting in a unique fatty acid which provides for its clinical proven health benefits. These benefits include significant reductions in body fat and a noticeable reduction in a wide variety of tumors. CLA fatty acids are also called CLA isomers.
 
 
 
 
 
 
 
 
 

Molecular structure of CLA

References:
http://www.eatwild.com/cla.html
http://www.ironmagazine.com/review9.html
http://www.clarinol.com/clarinol/front/what_is_it.html?id=38