Preventive Role of Probiotics in During Nutrition. There are various beneficial bacteria known as “probiotics” around the world. These microorganisms include lactic and acetic acid bacteria and yeast. Most probiotics are considered safe for human health, but some can be dangerous. The most famous product containing probiotic microorganisms is kefir. However, in addition to this product, there are many other products enriched with lactobacilli or bifidobacteria. The need to use probiotic supplements for the human body is due to the fact that