 Eligible patients will receive AST-120 sachets at 2g three times daily TID to be taken between meals at 10:00 am, 3:00 pm and immediately before going to bed for 4 complete weeks. AST-120 is a tasteless, odorless, oral preparation. To take the product, patients will tear open the sachets, drop the contents directly on their tongue and wash it down with 8 ounces of water. Patients will be evaluated at baseline and week 4 or early termination by the study physician, including endoscopies with histology and routine laboratory tests. Patients will be checked on a weekly basis by the study coordinator by phone for symptom response, compliance, and development of adverse events. Quality of Life Assessments Cleveland Global Quality of Life and Short Inflammatory Bowel Questionnaire will be conducted at baseline and week 4 or early termination. A patient is defined as having completed study treatment if heshe has received investigational product and is followed for safety through the last on-site visit of the 4 week treatment course. 