Is E317 (Erythorbic Acid / Iso-ascorbic Acid) Halal?

MUIS lists E317 (Erythorbic Acid / Iso-ascorbic Acid) as doubtful (mashbooh), which means the source cannot be confirmed from the E-number alone — not that it is haram. It is produced by fermentation, and the fermentation medium, nutrients and processing aids vary by manufacturer and can include animal-derived ingredients. The additive itself is not haram; its status depends on how the producer makes it. The reliable check is a recognised halal certification logo on the finished product, or a manufacturer statement of the source.

Erythorbic acid (iso-ascorbic acid) is a stereoisomer of ascorbic acid produced by fermentation with Penicillium fungi. It has antioxidant activity but no significant vitamin C function.

• cured meats
• frozen seafood
• soft drinks
• canned fruits

• 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.

ascorbic acid (E300), sodium erythorbate (E318), sodium ascorbate (E301)

E317 (Erythorbic Acid/Iso-ascorbic Acid) is doubtful for Muslims according to the MUIS food additive listing. Erythorbic acid (iso-ascorbic acid) is a stereoisomer of ascorbic acid produced by fermentation with Penicillium fungi.

Erythorbic acid (iso-ascorbic acid) is a stereoisomer of ascorbic acid produced by fermentation with Penicillium fungi. It has antioxidant activity but no significant vitamin C function.

E317 is commonly found in cured meats, frozen seafood, soft drinks, and canned fruits.