A friend of mine had to take several courses of antibiotics. Not long after, she developed very painful colitis. When I became aware of this, I talked to her about milk kefir and asked her if she would like to try it. She said yes, and I got her started. That was 2 weeks ago. Last Sunday, I asked her if it is helping. Her reply? "Oh, yes!" Now, I realize that her case is not a well established, long lasting problem. I have no idea if this would help others, but in her situation, it has made a big positive difference.