This article reviewed the mechanisms of action of probiotics and the possible effects of individual strains on the general wellbeing if they are taken daily.The content and activity of bacteria in food products should be regulated by special guidelines. The balanced nutrition allows us to get healthy strains in a natural way. Daily consumption of certain strains as part of functional food products is promising for the prevention of obesity, type 2 diabetes mellitus, non-alcoholic fatty liver

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... ease, functional intestinal disorders, colon cancer, cardiovascular diseases and depression. The issues of safety of novel probiotic strains newly introduced in clinical practice require careful consideration. Synbiotics can comprise probiotic strains of bacteria (Lactobacillus acidophilus La-14, Lactobacillus rhamnosus Lr-32, Bifidobacterium lactis Bl-04) with tolerance to acid, pepsin and bile salts, as well as the prebiotic inulin and vitamins B1, B2, B6 and B12 contributing to survival of beneficial bacteria. L. acidophilus is a common probiotic that occurs in the natural environment and food products, no cases of antibiotic resistance of this species have been established. Strains Lactobacillus acidophilus La-14, Lactobacillus rhamnosus Lr-32, Bifidobacterium lactis Bl-04 have a high adhesion capacity, strong inhibitory effects on intestinal pathogens, including fungi, anti-inflammatory effects, help to eliminate oxalates. As can be seen from the above, the use of probiotics and synbiotics is one of the most promising preventive fields of medicine.