Purathick Natural Thickener, 4.4 ounce (125 gram) Jar for hot and cold liquids. 520 calories (52 servings at 10 calories/serving). Thickens hot and cold liquids, and food, for adults and children with swallowing difficulties. Thickening feeds is the mostsuccessful feeding intervention associated with improved outcomes for children and adults with oropharyngeal dysphagia.