Probiotics, or gut flora, are the natural bacterial barrier that line the entire digestive tract and protect us from invasive pathogenic (disease-causing) micro-organisms such as yeast, opportunistic bacteria and parasites, as well as chemicals and toxins that we swallow with food and drink every day. These tiny, invisible residents of the human body are essential to our wellbeing and life itself. They neutralize carcinogenic pathogens, chelate heavy metals, synthesize many of our B vitamins, amino acids, and proteins as well as assist calcium, iron and vitamin D absorption. Unfortunately, in our world today, this very tiny, but large population of micro-bacteria can be destroyed and reduced in population by antibiotics, long term prescription drug use, processed foods, stress, alcoholism, pollution, radiation and exposure to toxic substances. So in order to be healthy, digest our food well, and defend our body against disease, it is critical that we continually repopulate and replace our gut flora. In fact, 90% of the cells and genetic material in our bodies is gut flora. Probiotics are found in foods, such as yogurts, and other naturally fermented foods, and can also be purchased in the form of capsules, liquids, and powders.