 Moreover, phytogenics have a pronounced impact on the gut microflora.Tannins are polyphenolic compounds produced by plants, ranging in concentrations from <2% to more than 20% of dry weight and may protect plants from herbivore, increase resistance against pathogens, or protect tissues such as wood against decay.In-vitro and in-vivo results suggest that two of the most abundant and common source of tannins, chestnut ("Castanea sativa"; hydrolyzable tannins) and quebracho ("Schinopsis lorentzii", condensed tannins) extracts, are effective to reduce and control infection.