Pure Powder Thickening Agent New Look! It may sound like a name from a cheesy sci-fi movie, but xanthan gum is actually a widely-used thickening agent. In fact, xanthan is legendary for its ability to increase liquid viscosity with just a tiny amount, and is stable throughout a wide range of temperatures and pH. With xanthan gum, a little goes a long way. NOW Real Food® Xanthan Gum is an excellent addition to your favorite sauces and dressings due to its ability to prevent oil separation and to keep solid particles, such as spices, suspended. It lends a smooth texture to many foods, making it a desirable addition to recipes.