Answer
Probiotics are live microorganisms that, when consumed in adequate amounts, can confer a health benefit on the host. The most common probiotics are lactic acid bacteria (LAB) such as Lactobacillus and Bifidobacterium. LAB are found naturally in the human body, especially in the intestines, and play an important role in maintaining a healthy digestive system. Probiotics can also be found in fermented foods such as yogurt, kefir, and sauerkraut.