Disodium inosinate, also known as E631, is the disodium salt of inosinic acid (IMP), a purine nucleotide naturally present in meat, fish, and some vegetables. It serves as a potent umami flavor enhancer in the food industry, often combined with monosodium glutamate (MSG) and disodium guanylate (E627) to create synergistic taste effects that amplify savory notes while allowing reduced sodium content. Produced via microbial fermentation of sugars or extraction from natural sources, it appears as a white crystalline powder stable under typical processing conditions. It interacts with T1R1/T1R3 taste receptors to intensify flavor perception in products like snacks, soups, sauces, and processed meats. Regulatory bodies including the FDA and EFSA approve its use as a food additive with no specified ADI due to its low toxicity profile.