Is Potassium Fumarate (E366) Halal?

MUIS lists E366 (Potassium Fumarate) as doubtful (mashbooh), which means the source cannot be confirmed from the E-number alone — not that it is haram. Although it is made synthetically, some production routes use animal-derived processing aids or carriers, and the E-number does not identify the producer. The reliable check is a recognised halal certification logo on the finished product, or a manufacturer statement of the source.

Potassium fumarate is the potassium salt of fumaric acid, used as an acidity regulator. Like fumaric acid, it is normally produced by chemical synthesis.

• powdered drinks
• low-sodium products
• gelatin desserts

• Look for a recognised halal certification logo (MUIS, JAKIM, MUI, HMC or similar) on the packaging — certified products have had the source of this additive verified.
• Check whether the label states the origin, for example 'vegetable origin', 'plant-based' or 'soy'.
• If there is no certification and the origin is not stated, contact the manufacturer or choose a product with a halal alternative.

fumaric acid (E297), sodium fumarate (E365), potassium citrates (E332)

E366 (Potassium Fumarate) is doubtful for Muslims according to the MUIS food additive listing. Potassium fumarate is the potassium salt of fumaric acid, used as an acidity regulator.

Potassium fumarate is the potassium salt of fumaric acid, used as an acidity regulator. Like fumaric acid, it is normally produced by chemical synthesis.

E366 is commonly found in powdered drinks, low-sodium products, and gelatin desserts.