Every human being is comprised of several microorganisms and bacteria (such as bacteria, viruses, and yeasts which can be viewed only under a microscope.) Several of these microscopic things are deemed to remain on the good side as well as feed on probiotics that are found on some nutritional supplements or perhaps foods. It does not always mean we have to nourish these good bacteria but the existence of such in the system of ours can provide health advantages which includes those of digestion and with the enhancement of one's immune system.