Acesulfame K Acesulfame K, also known as Acesulfame Potassium or Ace-K, is a high-intensity artificial sweetener that is commonly used as a sugar substitute in various food and beverage products. It is a white, odorless powder that is about 200 times sweeter than sucrose (table sugar), but it has no caloric value and does not affect blood sugar levels. Acesulfame K is chemically stable and can withstand high temperatures, making it suitable for use in baked goods and other heat-processed products. It is often found in sugar-free or low-calorie products, such as diet sodas, sugar-free chewing gums, desserts, and tabletop sweeteners.