Acesulfame-K (Ace-K)
sweetenerAn artificial sweetener ~200x sweeter than sucrose, zero calories, heat-stable, with a slightly bitter aftertaste often masked by blending with other sweeteners.
Definition
An artificial sweetener ~200x sweeter than sucrose, zero calories, heat-stable, with a slightly bitter aftertaste often masked by blending with other sweeteners. FDA approved since 1988. Found in Diet Coke and many sugar-free products.
What Is Acesulfame-K?
Acesulfame potassium, commonly abbreviated as Ace-K or acesulfame-K, is a zero-calorie synthetic sweetener approximately 200 times sweeter than sucrose. It is a potassium salt of 6-methyl-1,2,3-oxathiazine-4(3H)-one-2,2-dioxide. The body does not metabolize acesulfame-K; it is absorbed and then excreted unchanged through the kidneys, meaning it contributes no calories or carbohydrates to the diet.
Acesulfame-K was discovered in 1967 and first approved for use in the United States in 1988. It is sold under brand names such as Sunett and Sweet One. Some people perceive a slightly bitter aftertaste, particularly at higher concentrations, which is why it is very commonly blended with other sweeteners — most notably aspartame or sucralose — to achieve a more balanced, sugar-like taste.
Safety and Acceptable Daily Intake
Acesulfame-K is approved by the FDA, EFSA, and regulatory agencies in over 90 countries. Established ADI values from major authorities are as follows:
| Authority | ADI (mg/kg body weight/day) |
|---|---|
| FDA | 15 |
| EFSA | 9 |
| JECFA | 15 |
Some researchers have raised questions about acesulfame-K's potential effects on the gut microbiome based on animal studies, but human data at typical exposure levels do not currently indicate significant harm. Regulatory bodies continue to review emerging evidence as part of routine post-market surveillance. Because acesulfame-K contains potassium, individuals with certain kidney disorders who must restrict potassium intake should be mindful of consumption, though the amounts delivered at typical use levels are very small.
Practical Uses
A key advantage of acesulfame-K is its excellent heat stability, making it one of the few high-intensity sweeteners that can withstand high-temperature processing. It is also stable across a broad range of pH levels. Common applications include:
- Diet and low-calorie carbonated beverages (frequently combined with aspartame or sucralose)
- Baked goods and pastries
- Gelatin desserts and pudding mixes
- Chewing gum
- Canned goods and syrups
- Pharmaceutical products such as syrups and tablets, to mask bitterness
Related Terms
Aspartame
An artificial sweetener ~200x sweeter than sucrose, providing 4 kcal/g but used in such tiny amounts it's effectively calorie-free.
Sucralose
A chlorinated artificial sweetener ~600x sweeter than sucrose.
Saccharin
The oldest artificial sweetener (discovered 1879), ~300-400x sweeter than sucrose, zero calories.