Tetrasodium pyrophosphate

Additive · E 450(iii)

Tetrasodium pyrophosphate is a phosphate salt that helps control acidity, bind minerals and keep food mixtures stable. Also called tetrasodium diphosphate, it is used in processed foods to manage texture and moisture, including some meat products, cheeses and other prepared foods.

Also known as

TSPP · tetrasodium diphosphate · sodium pyrophosphate tetrabasic · sodium pyrophosphate, tetrabasic · tetrabasic sodium pyrophosphate · diphosphoric acid tetrasodium salt · diphosphoric acid, tetrasodium salt · pyrophosphoric acid tetrasodium salt · sodium diphosphate anhydrous · sodium pyrophosphate · E 450(iii) · E450(iii) · INS 450(iii)

Why PRūF tracks it

Tetrasodium pyrophosphate adds to total phosphorus exposure, with kidney injury at high repeated doses in rats and newer kidney-cell signals, while evidence of disease from ordinary human food intake remains limited.

Read the research

Tetrasodium pyrophosphate is one defined diphosphate, and its effects need to be considered alongside phosphorus from the rest of the diet. Most is broken down to phosphate, although a small human study showed that some pyrophosphate enters the blood after a single dose. In a direct rat study, high repeated doses caused kidney changes; lower doses did not produce the same adverse findings. A July 2026 laboratory study found inflammatory and fibrosis-related responses in kidney cells, but it did not demonstrate kidney disease in people.

Short human studies of mixed phosphate additives show changes in mineral regulation, with uncertain long-term significance. EFSA set a group daily intake value of 40 mg phosphorus per kilogram of body weight from all dietary sources and estimated exceedance in some younger groups and high consumers. That value does not protect people with moderate or severe kidney impairment. JECFA retains a different group value of 70 mg phosphorus per kilogram.

Food use remains permitted with conditions, while a former US organic meat-analogue allowance was removed because alternatives were available. These findings support concern about cumulative exposure and vulnerable kidneys without establishing disease from ordinary TSPP consumption.

Research reviewed on September 5, 2026 · 12 sources