 Conjugated linoleic acids CLA are naturally occurring free fatty acids derived from the tissues and milk of ruminant animals such as cows. CLA has multiple biological properties including regulation of metabolism and immune processes, including tissue inflammation. Asthma symptoms are caused by irritation and inflammation of the airways. Our hypothesis was that CLA may reduce airway inflammation in asthma and thus reduce asthma symptoms. The aim of this pilot study was to investigate the efficacy and safety of CLA as a dietary supplement in mild asthma. Subjects will be assigned to take CLA dietary supplements or placebo olive oil for 12 weeks in addition to their usual asthma treatment. They will be monitored for asthma symptoms, side effects, lung function and blood markers of inflammation. 