Dipotassium guanylate

Dipotassium guanylate is the potassium salt of guanylic acid, used as an umami flavour enhancer in soups, seasonings, snack flavours, and processed foods. Compared with disodium guanylate (E627), it provides the same nucleotide-based umami enhancement while adding potassium rather than sodium, making it relevant in low-sodium product reformulation. It operates through synergistic interaction with glutamate-class enhancers, dramatically amplifying umami intensity at low combined concentrations.

JECFA classified the ADI for guanylate additives as "not specified" in 1987, consistent with their status as naturally occurring nucleotide components. The potassium component is an essential mineral, and guanosine monophosphate is a normal cellular metabolite. Neither component raises safety concerns at food additive use levels. However, the purine content of all guanylate compounds is medically relevant for a subset of consumers.

Dipotassium guanylate is approved in the EU and internationally for use in a broad range of processed foods. The key consumer advisory applicable to E628, as to all guanylate and inosinate enhancers, concerns purine metabolism: these additives contribute dietary purines that are broken down to uric acid, and individuals with gout or elevated uric acid levels should limit consumption of foods containing E628 and related nucleotide enhancers (E626–E634). E628 may not appear as often as E627 on ingredient labels, but it serves the same flavour function and carries the same dietary consideration.