Potassium phosphates

Potassium phosphates are the potassium salts of phosphoric acid, used as acidity regulators, buffering agents, emulsifying salts, and sequestrants in food. They appear in processed cheese, meat products, convenience foods, dairy alternatives, and sports drinks, where they maintain pH stability, improve texture in processed cheese, and prevent mineral precipitation in beverages.

JECFA established a group ADI of 70 mg per kilogram of body weight per day for phosphoric acid and all phosphate salts, expressed as phosphorus, following its 1982 evaluation. This ADI is shared with E338 (phosphoric acid), E339 (sodium phosphates), E341 (calcium phosphates), and E450 (diphosphates). For a 70 kg adult the ceiling is 4,900 mg per day as phosphorus. The principal concern is cumulative: high total phosphate intake from food additives — compounding the phosphorus naturally present in meat, dairy, and grains — is associated with elevated cardiovascular and renal strain, especially in individuals with impaired kidney function.

Potassium phosphates are approved in the EU (E340), the United States, and most global markets. People with chronic kidney disease should be particularly attentive to total phosphate intake from food additives. For the general population, risk is associated with habitual heavy consumption of highly processed foods rather than any single product. Looksee assigns a limit rating reflecting the cumulative phosphate burden concern.