Is Potassium Sodium Tartrate (E337) Halal?

MUIS lists E337 (Potassium Sodium Tartrate) as doubtful (mashbooh), which means the source cannot be confirmed from the E-number alone — not that it is haram. Although the base material is plant-derived, 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 sodium tartrate (Rochelle salt) is a double salt of tartaric acid, used as a buffering agent and emulsifier. It also has industrial uses in silvering mirrors and electroplating.

• processed cheese
• baked goods
• jellies
• meat products

• 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.

tartaric acid (E334), sodium tartrate (E335), potassium tartrate (E336)

E337 (Potassium Sodium Tartrate) is doubtful for Muslims according to the MUIS food additive listing. Potassium sodium tartrate (Rochelle salt) is a double salt of tartaric acid, used as a buffering agent and emulsifier.

Potassium sodium tartrate (Rochelle salt) is a double salt of tartaric acid, used as a buffering agent and emulsifier. It also has industrial uses in silvering mirrors and electroplating.

E337 is commonly found in processed cheese, baked goods, jellies, and meat products.