The direct verdict: xanthan gum (E415) is halal. It contains nothing from an animal, nothing from alcohol, and nothing source-ambiguous — which makes it one of the easy E-codes, and a rare piece of good news if you’re scanning a long ingredient list.
The reason people ask about it is the word “fermentation”. Xanthan gum is made by feeding plant sugar — glucose or sucrose from corn, wheat, or sugar cane — to the bacterium Xanthomonas campestris. The bacteria digest the sugar and secrete the gum, which is then precipitated, dried, and milled into powder. Fermentation here means bacterial digestion, not brewing: no ethanol ends up in the final product, and the isopropyl alcohol sometimes used to precipitate the gum is a processing aid that is fully removed and was never khamr (w
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