The next ingredient we’re covering in our ongoing series on Not So Healthy Ingredients for Your Pet is xanthan gum. Xanthan gum is something humans should try to avoid in their own food and their pet’s food as well. What is xanthan gum? Xanthan gum is a powdery, sugar like substance that is used as a thickening or stabilizing additive in foods, toothpastes and medicine. It can be used to treat lower blood sugar and cholesterol in people with diabetes. While it is FDA approved as a food additive,