The article goes on to say that CLA improved the condition/symptoms of 50% of participants. The dosage for 90 days was 6 grams orally of CLA--a commonly available supplement derived from safflower oil.
I think the original study is called:
"Conjugated linoleic modulates immune responses in patients with Mild to Moderately active Crohn's disease"--out of the publication, Clinical Nutrition.