Probiotics are live bacteria that are good for health, especially digestive system. Probiotics are called "helpful" bacteria because they help keep our gut healthy. Probiotics are “good” bacteria that help keep your digestive system healthy by controlling growth of harmful bacteria. They may help keep healthy by decreasing the number of "bad" bacteria in your gut that can cause infections or inflammation and restoring the body's "good" versus "bad" bacterial balance, which then helps to keep your body functioning properly.