Monopotassium glutamate

Monopotassium glutamate is the potassium salt of glutamic acid, providing the same umami-enhancing function as monosodium glutamate (E621) with a lower sodium contribution. It is used in soups, seasonings, sauces, and processed foods where umami intensification is desired, particularly in low-sodium formulations where reducing sodium chloride and sodium glutamate while maintaining savoury character is a product development priority.

JECFA assessed monopotassium glutamate as part of its 1987 review of the glutamate class and classified the ADI as "not specified." This determination reflects the fact that glutamate is a normal dietary amino acid metabolised through well-established pathways, and that the potassium component is an essential mineral. There is no identified need for a quantitative upper limit at levels used in food applications.

Monopotassium glutamate is approved in the EU and internationally for use as a flavour enhancer. In the context of sodium reduction strategies, it offers the advantage of delivering umami taste without adding sodium, which can allow manufacturers to maintain flavour quality while reducing total sodium content. Like other glutamate additives, it may be used synergistically with nucleotide enhancers (E626–E635) to amplify umami intensity through the synergistic effect between glutamate and purine nucleotides. Individuals who monitor glutamate intake for perceived sensitivity should be aware that E622 represents the same functional and chemical class as E621 (MSG), despite the different cation.