1. Composition for the prevention and treatment of imbalances in the vaginal microflora, containing:! - a prebiotic selected from gluco-oligosaccharides (GOS), fructo-oligosaccharides (FOS) and mixtures thereof; and! - a plant extract containing isoflavones selected from formononetin, biochanin A, genistein, daidzein, genistin, daizin, equola and mixtures thereof. ! 2. The composition according to claim 1, for the prevention and treatment of bacterial vaginosis, vaginal candidiasis and vaginal mycosis. ! 3. The composition according to claim 1 for the restoration of beneficial vaginal flora after treatment with antibiotics. ! 4. The composition according to claim 1, to restore the physiological values of the vaginal pH, approximately equal to 4.5. ! 5. The composition according to claim 1, containing from 0.5% to 7% prebiotic and from 0.5% to 5% of a plant extract containing isoflavones. ! 6. The composition according to claim 1, in which the plant extract contains at least 10 ppm (ppm) of isoflavones. ! 7. The composition according to claim 1, in which the plant extract is selected from soybean extracts (Glycine max), clover extracts (Trifolium sp.) And mixtures thereof. !8. The composition according to claim 1, in which the plant extract is a clover extract selected from the species Trifolium subterraneum L., Trifolium repens L. and Trifolium pratense L.! 9. The composition according to claim 1, in which the plant extract is an extract of Trifolium pratense L., containing at least genistein, daidzein and formononetin. ! 10. The composition according to claim 1, in which the prebiotic contains α-1,6 / α-1,4 GOS, having a degree of polymerization of at least 4.! 11. The composition according to claim 1, in which the prebiotic contains FOS, consisting of a mixture of FOS having a degree of polymerization of at least 4, 5 and 6.! 12. The composition according to claim 1, in the form of a vaginal1. Композиция для предупреждения и лечения нарушения баланса вагинальной м