The invention relates to a probiotic formula involving cooperation of strains of probiotic microorganisms, isolated as it is, from a traditional dairy product in Rhodope mountains, to a process of preparation of the probiotic formula and its use as a dietary food for people with impaired liver function and structure, for controlling the symptoms of food allergy and for recovering the normal vaginal lactobacillaceae flora of women. More precisely, the probiotic cooperation of strains microorganisms includes strain Lactobacillus delbrueckii subsp. bulgaricus DMR1, registered in CCM under Nº 8591/ 17.02.2015； strain Lactobacillus delbrueckii subsp. bulgaricus DMR2, registered in CCM under Nº 8592/ 17.02.2015； strain Streptococcus thermophilus DMR3, registered in CCM under Nº 8591/ 17.02.2015 and strain Streptococcus thermophilus DMR4, registered in CCM under Nº 8592/ 17.02.2015. In a ratio-of 1:0.005 this probiotic cooperation is used for fermentation of a standardized and pasteurized cow's milk or goat's milk for preparation of the probiotic formula, which after lyophilization and storage for 24 months at a room temperature up to 24°C, contains alive cells of the probiotic cooperation, in concentration from 1.1x109 cfu/g to 1.6x109 cfu/g.
