Calcium gluconate

Calcium gluconate is the calcium salt of gluconic acid, combining a well-absorbed form of calcium with the mild organic gluconate anion. In food applications it functions as an acidity regulator, sequestrant, firming agent, and mineral supplement, adjusting pH, chelating metals, and delivering bioavailable calcium to the food matrix. It is used in mineral water, dairy alternatives, canned vegetables, and a variety of fortified products. In some fruit and vegetable applications it also helps preserve texture by interacting with pectin in cell walls.

No numerical JECFA ADI has been established for calcium gluconate, consistent with the treatment of gluconate salts generally. Calcium is an essential macronutrient required for bone, muscle, and nerve function, and gluconate is a natural metabolite. Both components are handled through normal physiological pathways, and no toxicological concern has been identified at levels used as a food additive. Bioavailability studies confirm that calcium from gluconate is well absorbed, making it a useful vehicle for food fortification.

Calcium gluconate is approved in the EU and broadly in international food regulations. It is listed as E578 on EU ingredient labels and as calcium gluconate in other markets. In addition to food use, it is widely used in pharmaceutical applications as an injectable calcium supplement for emergency treatment of hypocalcaemia and as an antidote in hydrofluoric acid exposure, which speaks to its documented safety profile at high medical doses. For food consumers, the amounts encountered as an additive are modest. It is generally well tolerated, including by individuals with dairy sensitivities, as it provides calcium without the proteins or lactose present in dairy sources.