E452 Polyphosphates

E452Acidity regulatorsOrigin: Mineral

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The short answer

Polyphosphates (E452) are long chains of phosphate that hold water in meat and seafood and keep cheese and sauces smooth. They are safe for most people, but they add phosphorus that kidney patients need to limit.

60/100

Use in moderation

Safe in small amounts; may bother some people or raise blood sugar.

E-numberE452

Comes fromMineral

What it doesAcidity regulators

Glycemic index—

Daily limitNot set

Also calledPolyphosphates, Sodium polyphosphate

Rules by country

🇺🇸 US FDAApproved

🇪🇺 European UnionApproved with limits

🇨🇦 Health CanadaApproved with limits

CaliforniaNo extra rules

Generally recognized as safe in the US for a range of foods. The EU and Canada allow it in listed foods only. EFSA's 2019 review counts polyphosphates with all other added phosphates under one group limit of 40 mg of phosphorus per kg of body weight a day.

Daily limit: Experts haven’t set a number because normal food amounts are far below any level of concern.

What is it?

Polyphosphates are glassy, water-soluble salts. They bind calcium and metal ions, which keeps proteins moist and stops emulsions from splitting. A few grams of them can make a frozen shrimp weigh more once thawed.

Where it comes from: Made from phosphoric acid, itself made from mined phosphate rock. Chains of phosphate units are joined by heating, then combined with sodium, potassium or calcium.

Why it’s in food

Holds water in shrimp and ham
Keeps processed cheese smooth
Stops sauces and puddings from splitting
Keeps frozen seafood plump

Often found in

Frozen shrimp and scallopsDeli meat and sausagesProcessed cheese slicesInstant puddingCoffee creamerCanned meat

Also listed as: Polyphosphates, Sodium polyphosphate, Potassium polyphosphate, Sodium hexametaphosphate, Sodium tripolyphosphate

Health & gut impact

Kidney diseaseUnder study

Phosphorus from additives is absorbed far more fully than phosphorus from whole foods. People with chronic kidney disease are usually told to avoid these additives.

National Kidney Foundation

Group limitUnder study

EFSA found that heavy users of processed food can exceed the group limit for added phosphates. Polyphosphates count toward that total.

EFSA Panel on Food Additives (2019)

Shrimp soaksConcern

Shrimp that are soaked in polyphosphate solution can carry much more water than the label suggests. That is a quality question as much as a health one.

US FDA Food Labeling Guide

Seafood and cheese without phosphate blends

Clean-label swaps

Clean grocery swap

Shrimp with no added solution

Frozen shrimp listed as shrimp only.

Shop plain frozen shrimp Opens your country’s Amazon store

Clean substitute

Block cheese, grated at home

Cut the anti-caking and phosphate blend out of the shred.

Shop block cheddar Opens your country’s Amazon store

Pantry staple

Citric acid

A plain acid that keeps sauces smooth at home.

Shop food-grade citric acid Opens your country’s Amazon store

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What can I use instead?

Citric acid

Ratio: To label

Best for: Keeping cheese sauce smooth

Dry-packed frozen seafood

Ratio: Pick the label

Best for: Shrimp without added water

More acidity regulators:

Acetic acid E260Acetic acid (E260) is the acid that makes vinegar sour. Diluted in food it is considered safe. The hazard is the concentrated factory form, not a splash of vinegar.Generally safe Ammonium carbonate E503Ammonium carbonate (E503) is a traditional leavening agent that makes thin cookies and crackers crisp. It breaks down into gas in the oven, so little of it stays in the finished food.Generally safe Calcium carbonate E170Calcium carbonate (E170) is ground limestone, the same calcium found in antacids. It adds calcium to plant milks and flour and is very safe.Generally safe Calcium chloride E509Calcium chloride (E509) is a salty calcium salt that firms tofu, cheese curds and pickles. It is considered safe at food doses. Too much tastes bitter, which is why recipes use a little.Generally safe

Common questions

Is E452 the same as E450 or E451?

They are all phosphate salts. E450 has two phosphate units, E451 has three, and E452 is a longer chain of many units.

Is Polyphosphates safe?

Use in moderation (60/100). Generally recognized as safe in the US for a range of foods. The EU and Canada allow it in listed foods only. EFSA's 2019 review counts polyphosphates with all other added phosphates under one group limit of 40 mg of phosphorus per kg of body weight a day.

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Scientific sources & regulatory citations

EFSA OpenFoodTox: E452
National Kidney Foundation
EFSA Panel on Food Additives (2019)
US FDA Food Labeling Guide

INS 452