Hi Ilene, if you're using a recipe that calls for Gluten-Free Flour, it will probably also call for xanthan gum since that flour doesn't already have some added to it. If you're converting a recipe to be gluten-free using our Measure for Measure Flour, you don't need to add xanthan gum because it already has it's already been added to the flour. We hope that helps! Kye@KAF

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