Enjoy Liquids Safely If you or your loved one have difficulty swallowing due to dysphagia, ThickenUp Clear improves swallowing safety compared to normal thin liquids. This advanced xanthan gum-based thickener mixes instantly into a wide range of foods and beverages, including juices, milk, coffee, tea, and broth soups. It does not over-thicken with time, is tasteless and odorless, and remains clear in water.* This nutritional product is intended for use under medical supervision.