Probiotics have been used to treat bowel problems (such as diarrhea, irritable bowel), eczema, vaginal yeast infections, lactose intolerance, and urinary tract infections. Probiotics are available in foods (such as yogurt, milk, juices, soy beverages) and as dietary supplements (capsules, tablets, powders).
At this time, researchers are undecided if probiotic supplements are effective. ... It also remains unclear which probiotics (or combination of probiotics) work to treat certain diseases. Some studies have shown positive results, but more research is needed to confirm that probiotics are safe and effective.