Acesulfame K, also known as Ace-K, is a calorie-free artificial sweetener that is commonly used in food and beverages as a sugar substitute. It is approximately 200 times sweeter than sugar, making it a popular ingredient in low-calorie and reduced-sugar products.

Ace-K is made by combining acetoacetic acid and potassium hydroxide. It has a clean, sweet taste that is similar to sugar, without any bitter aftertaste. Unlike other artificial sweeteners, Acesulfame K is stable at high temperatures, making it suitable for use in baked goods and other heated products.

In addition to its use as a sugar substitute, Ace-K is also used to enhance the flavour of food and beverages. It is often combined with other sweeteners, such as sucralose or aspartame, to create a more balanced and satisfying taste.

Despite its widespread use, some studies have raised concerns about the safety of Acesulfame K. However, regulatory agencies such as the FDA and the European Food Safety Authority have concluded that it is safe for human consumption when used within recommended levels.