The Health Benefits of Probiotics http://www.pamelaegan.com/probiotics_0001/ Quoting from source: "Few people realize that a healthy immune system is dependent on a healthy lower intestine. What are probiotics, you may ask? A probiotic is an organism which contributes to the healthy balance of the intestinal tract. A probiotic is also referred to as the “good” or “friendly” bacteria. These beneficial bacteria help to maintain a healthy intestinal tract and help fight illness and disease."