Acesulfame Potassium (Ace-K)
Acesulfame potassium, often written as Ace-K or acesulfame-K, is a high-intensity artificial sweetener about 200 times sweeter than sugar. It is heat-stable and frequently blended with sucralose or aspartame to round out flavor.
Why It Matters
Ace-K is calorie-free, does not raise blood glucose, and survives high temperatures, making it useful in baked protein bars and ready-to-drink shakes that face pasteurization. It is approved by the FDA, EFSA, and similar bodies worldwide and has been in use since the 1980s.
Ace-K can carry a slightly metallic aftertaste at higher doses, which is why brands almost always pair it with sucralose. If you are sensitive to sweetener flavors, look for products using only stevia, monk fruit, or sugar.
How to Spot It on a Label
Look for acesulfame potassium, acesulfame K, or Ace-K in the ingredient deck. It commonly appears alongside sucralose in mainstream RTDs and bars. Brands avoiding artificial sweeteners will state no artificial sweeteners on the front.
Examples from real products
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