Is Potassium Phosphates (E340) Vegan?

Hot black coffee sits around pH 5 and holds enough acid to destabilize a milk or plant emulsion. Cream feathers into curds, oil separates, and the surface goes speckled. Dipotassium phosphate buffers against that. Added to a creamer or a barista-grade plant milk, it holds the pH high enough that proteins stay soluble and the fat droplets stay dispersed, so the drink stays smooth.

Baristas encountering split oat milk are usually looking at a carton without that buffer, or at very hot, very acidic coffee. Sports drinks use phosphates as electrolytes. Processed cheese uses them as emulsifying salts alongside citrates, and powdered drink mixes use them to control acidity. In each case the additive is mineral, and its presence tells you nothing about whether the product contains dairy.

Two intake questions attach to this additive, and both concern specific groups. EFSA set a group acceptable daily intake for phosphates in 2019 at 40 mg per kilogram of body weight per day as phosphorus, and flagged that high consumers of processed food can exceed it. People with chronic kidney disease are usually advised to limit phosphate additives, because additive phosphorus is absorbed far more completely than the phosphorus bound in plant and animal tissue.

The potassium half matters for the same group. Advanced kidney disease often comes with potassium restriction, and potassium-based additives contribute. For everyone else, dietary potassium is beneficial and typically under-consumed, and the amounts in these additives are small next to a banana or a portion of beans.