Bob's Red Mill Xanthan Gum is perfect for gluten-free baking. It is made from the outer layer of a tiny, inactive bacterium called Xanthomonas campestris. It is an excellent all-purpose thickener for dressings, gravies and sauces. Its unique binding ability is what makes it the ideal substitute for gluten in gluten-free baking. Most recipes call for only 1 or 2 teaspoons, so this little bag will go a long way in your kitchen.