Probiotics are a combination of live beneficial bacteria and/or yeasts that naturally live in your body. Bacteria is usually viewed in a negative light as something that makes you sick. However, you have two kinds of bacteria constantly in and on your body — good bacteria and bad bacteria.
Probiotics are made up of good bacteria that helps keep your body healthy and working well. This good bacterium helps you in many ways, including fighting off bad bacteria when you have too much of it, helping you feel better.