Potassium carbonates

Potassium carbonates — potassium carbonate (K₂CO₃) and potassium bicarbonate (KHCO₃) — are inorganic salts that function as leavening agents and acidity regulators in food. They provide the same alkalinity as sodium carbonates (E500) but are valued as sodium-free alternatives in reduced-sodium products. Potassium bicarbonate is used in wine to reduce acidity and in baking as a baking soda substitute in low-sodium formulations.

JECFA's ADI is "not specified," evaluated in 1975. Potassium carbonates dissociate to potassium and carbonate ions in solution; the carbonate reacts with acid ingredients to release carbon dioxide for leavening. Both components are normal human metabolites. No adverse effects have been identified at any realistic dietary exposure from food additive use.

Potassium carbonates are approved in the EU, US (GRAS), UK, and globally. They are found in certain bakery products, cocoa processing (Dutch-process cocoa uses potassium carbonate for alkalization), wine, and low-sodium food formulations. The potassium content is nutritionally beneficial for most adults. People with renal disease managing potassium intake should be aware, but for healthy adults there are no safety concerns.