Pentapotassium Triphosphate
Also known as: E451ii, potassium triphosphate, potassium tripolyphosphate, KTPP, E451
Triphosphates are part of the phosphate additive family that EFSA reassessed in 2019, setting a group ADI of 40 mg/kg bw/day as phosphorus, with concerns that exposure may exceed the ADI in some consumer groups (notably children). Considered safe at GMP levels but cumulative dietary phosphate intake is the concern.
What it is
Pentapotassium triphosphate (E451(ii)) — a potassium salt of triphosphoric acid used as a food additive.
Emulsifier, stabilizer, sequestrant, and water-binding agent in processed meats, seafood, and dairy.
Why it's flagged
- Cumulative phosphate intake may exceed ADI in some populations
- Concerns for chronic kidney disease patients
What regulators actually say
"The Panel established a group acceptable daily intake (ADI) for phosphates of 40 mg/kg body weight per day, expressed as phosphorus."
Regulatory status
United States — FDA
GRAS under 21 CFR 182.1810 (sodium tripolyphosphate) / GRAS for potassium phosphates.
European Union — EFSA
Authorized; included under group ADI of 40 mg/kg bw/day as P.
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