Like its better-known bacterial cousin, acidophilus, the bifidobacteria group (also called ‘bifidus’) are considered a “probiotic.” One of the hundreds of beneficial bacteria that inhabit your body’s intestinal tract, bifidobacteria helps to fight off infection. Probiotics such as these are especially helpful in preventing the diarrhea that often results from antibiotic therapy. They ease other gastrointestinal conditions as well, including irritable bowel syndrome and flatulence. They also help to prevent vaginal and urinary tract infections, and counteract the overgrowth of the fungus Candida albicans.