The active ingredient of Hübner Original Silicea® Gastro-Intestinal Gel is silica gel (silicic acid gel), a compound made up of the mineral silicon (Si) with oxygen and water. Silica gel has an unusual high bonding capacity not only for pathogens and their toxins but also for gases. Thus it can also reduce annoying flatulence. This means that gases, pathogens and their toxins are bound by a purely physical process in the gastrointestinal tract and excreted naturally by the intestine. It soothes the symptoms and supports the regeneration of the upset gastrointestinal tract.