Acesulfame potassium is an artificial sweetener also known as Ace-K. Acesulfame potassium is approved by the U.S. Food and Drug Administration (FDA) as an alternative sweetener. More than 90 studies have been done that show it's safe to use. Since it's more than 200 times sweeter than sugar, manufacturers can use far less acesulfame potassium, lowering the amount of calories and carbohydrates in a product. Ace-K is often combined with other artificial sweeteners and most often used in beverages, frozen desserts, baked goods, candies, yogurt, sauces, and chewing gum.