Fructo-oligosaccharides (FOS) are a form of soluble carbohydrates found in many vegetables, such as endives and onions, but when taken orally they are only partially absorbed, as the majority of them are used as a nutrient substrate for the growth of normal intestinal bacterial flora . This results in the prebiotic effect of fructo-oligosaccharides, i.e. the growth of bacteria of the normal intestinal flora and the reduction of pathogenic bacteria and fungi, while the prebiotic function of FOS leads to the improvement of intestinal tone, the regulation of intestinal peristalsis and the improvement of gastrointestinal complaints due to intestinal dysfunction. Nutritional research has shown that daily intake of 8g of FOS for 2 weeks is accompanied by an increase in the number of bacteria of the normal intestinal flora as it is accompanied by a tenfold increase in Bifidobacteria, a threefold increase in Lactobacilli, while causing a simultaneous one-fold decrease in pathogenic bacteria Bacteriodes. It is suitable for all ages, including children and pregnant women, as well as for people following a yeast-free diet, and for people under medication, and can be used for a long period of time.