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Xanthan gum is a food additive derived from bacteria in plants. It has wide applications, including thickening foods and replacing gluten in gluten-free cooking. Besides basic applications, xanthan gum can also be used in molecular gastronomy to create new textures for food. Xanthan gum can be found in most major supermarkets, Whole Foods, or online. For more information on xanthan gum, click here.