Hi Ashley,Probiotics promote friendly bacteria in the large intestines. The natural flora in the intestines are restored with Probiotics. I use Culturelle which has lots of probiotics (health-promoting) good bacteria. It helps me with gas, running D, and vaginal yeast infections.People on this board use different kinds of Probiotics (including Culturelle). They can be gotten in the pharmacy section of stores or in health food stores.I order Culturelle by phone. Their number is on their site.For more information on Culturelle click on: http://www.culturelle.com/index.html Hope you find something that works for you.------------------vikee