My son has ulcerative colitis. This has been a life saver to keep him off of prescription drugs. Give it 8 days to stop the diarrhea and bleeding, it will change your life! Works great in conjuction with Primal Defense and Alive multivitamins to give him plenty of energy. ****2/09 Felt I should add this since I had to take my son off of S. Boulardii after about a year and a half. He began having other allergy symptoms and we found he had developed an allergy to the product itself. Even though it continued to control his Ulcerative Colitis, he began having inflamation in his eyes and a rash on his arms. It says right on the bottle "not for long term use". If you want to find long term help with Ulcerative Colitis and other allergy problems try LDA! It is the only thing that has had a permanent help (http://drshrader.com/).