Probiotics are live microorganisms thought to be beneficial to the host organism. According to the currently adopted definition by FAO/WHO, probiotics are: "Live microorganisms which when administered in adequate amounts confer a health benefit on the host". Lactic acid bacteria (LAB) and bifidobacteria are the most common types of microbes used as probiotics; but certain yeasts and bacilli may also be helpful. Probiotics are commonly consumed as part of fermented foods with specially added active live cultures; such as in yogurt, soy yogurt, sauerkraut, miso, kimchi, or any other fermented food you can purchase or make yourself. Milk kefir and water kefir are excellent sources of probiotics that can be consumed daily as dietary supplements.
==Special Precautions of Probiotics==
Probiotics should not be used by people with impaired immune systems, such as patients with HIV/AIDS or who are taking medications that weaken the immune system. Probiotics can cause dangerous infections in people with compromised immune systems, including sepsis, a potentially life-threatening condition.
==The benefits of Probiotics are==
* Acidophilus is a group of probiotics known to improve digestion, nutrient absorption and reduce the risk of developing colon cancer, colorectal cancer and other diseases linked to an unhealthy colon microflora.