The human body contains billions of different bacteria with some occurring naturally (normal micribiota or normal flora) and other microorganisms. Some are bad, but many bacteria give us all sorts of different health benefits like helping digestion, producing vitamin K and helping the immune system. Some probiotic bacteria lives in the digestive tract and aid digestion. Probiotic bacteria are found in foods like yogurt, kefir and other dairy, soy and fruit products.
These probiotic bacteria thrive and reproduce in the digestive tract, and colonizing the intestines. Many of the good probiotic bacteria help to crowd out pathogens, maintaining a healthy microbial balance in our body. Not having enough healthy bacteria can cause digestive disorders causing abdominal pain, cramping, bloating, gas, diarrhea and or constipation.