E501 Potassium carbonate (Potash)

E501Acidity regulatorsOrigin: Mineral

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The short answer

Potassium carbonate (E501) is an alkaline mineral salt that darkens cocoa and gives ramen noodles their springy bite. It is safe, vegan and gluten-free.

86/100

Generally safe

Fine for most people at normal amounts.

E-numberE501

Comes fromMineral

What it doesAcidity regulators

Glycemic index—

Daily limitNot set

Also calledPotash, Dipotassium carbonate

Rules by country

🇺🇸 US FDAApproved

🇪🇺 European UnionApproved

🇨🇦 Health CanadaApproved

CaliforniaNo extra rules

Approved in the US, EU and Canada as a pH regulator and leavening agent. It is the key alkali in Dutch-process cocoa and in traditional alkaline noodles.

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

What is it?

Potassium carbonate is a mild alkali. Adding it raises the pH of cocoa, which mellows its sharp flavor and deepens the color. In noodles it changes how the wheat proteins set, so they stay chewy and yellow.

Where it comes from: Mined as potash or made from potassium-rich brines. It is an alkaline salt used to adjust pH and deepen color in cocoa and noodles.

Why it’s in food

Makes cocoa darker and milder (Dutch process)
Gives alkaline noodles their bite and yellow tint
Acts as a leavening agent in some crackers
Adjusts pH in candy and sauces

Often found in

Dutch-process cocoaRamen noodlesSome pretzelsChocolate dessertsCrackers

Also listed as: Potash, Dipotassium carbonate, Potassium salt of carbonic acid, E501

Health & gut impact

Potassium intakeUnder study

It adds a small amount of potassium. People with advanced kidney disease who limit potassium should count it, though the amount used is minor.

EFSA Panel on Food Additives (2012)

What can I use instead?

Sodium carbonate

Ratio: 1:1 by weight

Best for: Alkaline noodles (taste is slightly different)

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 potassium carbonate the same as baking soda?

No. Baking soda is sodium bicarbonate, a milder salt. Potassium carbonate is stronger and is used for darker cocoa and noodle texture.

Is Dutch-process cocoa made with E501?

Often yes. Many Dutch-process cocoas use potassium carbonate, which the label may list as potassium carbonate or an alkali.

Is Potassium carbonate safe?

Generally safe (86/100). Approved in the US, EU and Canada as a pH regulator and leavening agent. It is the key alkali in Dutch-process cocoa and in traditional alkaline noodles.

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Scientific sources & regulatory citations

EFSA OpenFoodTox: E501
EFSA Panel on Food Additives (2012)

INS 501 · CAS 584-08-7