 Background and Purpose You are being invited to participate in a study of the effects of a natural supplement, conjugated linoleic acid CLA, on allergy and asthma. Previous studies show that CLA may control the type of inflammation found in allergy and asthma. CLA is found in dairy products, however the amount found varies greatly depending on what the cows have been fed and has reduced dramatically over the last 30 years. The estimated daily intake of CLA is between 15 and 174 mgday, but an effective dose of CLA is 3000 to 4000 mgday for a 70 kg adult. Therefore taking CLA supplements may be beneficial. This will be the first formal study to look at whether CLA does benefit people with allergies and asthma. 