Probiotic yogurt, which has recently had a huge surge in popularity, has other cultures in addition to Lactobacillus bulgaricus and Streptococcus thermophilus. These additional bacteria are useful in preventing and treating many intestinal conditions including irritable bowel syndrome, constipation, diarrhea, C. Diff (Clostridium difficile), and intestinal flora imbalance caused by the use of antibiotics.