Disodium inosinate is a food additive that is used to enhance the flavor of various processed foods. It is commonly listed on ingredient labels as E631. Disodium inosinate is typically derived from a natural source, such as dried fish or meat, where it occurs naturally in small amounts. However, due to the relatively limited availability of these natural sources, commercial production involves a fermentation process using bacterial cultures, primarily the bacterium Bacillus subtilis. It is commonly used alongside MSG to enhance snacks, soups, sauces, and other food products with an umami flavor.