Acesulfame Potassium (E950)

What is acesulfame K and what is it used for?

Acesulfame potassium is a sweetener synthesised in the laboratory that passes through the body unchanged and is excreted in urine. Because it provides no energy, it replaces sugar in products labelled “sugar-free”, “light” or “diet”.

Its most important technical advantage is that it is heat-stable, so it can also be used in cooked and baked products. Because it can leave a slightly bitter aftertaste at high levels, it is usually combined with aspartame or sucralose; these blends bring the taste closer to sugar and require less sweetener overall.

Which products contain it?

• Diet, light and “no added sugar” fizzy drinks
• Sugar-free chewing gum and sweets
• Sugar-free or low-calorie yoghurts, puddings and milk desserts
• Protein powders, flavoured water and sports drinks
• Some medicines and supplements, such as syrups and chewable tablets

On the label it appears as “sweetener (acesulfame K)” or “sweetener (E950)”. Under EU and Turkish legislation, products containing sweeteners must carry the statement “with sweetener(s)”.

Is it harmful? The scientific assessment

Acesulfame K has been used for decades and has been assessed by bodies such as EFSA and the US Food and Drug Administration (FDA). These bodies have set an acceptable daily intake (ADI); a person eating a normal diet would have to consume very large amounts of sweetened products every day to approach this limit. EFSA's re-evaluation also found no safety concern at current levels of use.

Cancer claims based on animal studies have not been considered sufficient by regulators; acesulfame K does not appear in any official carcinogen classification. Possible effects on the gut microbiota and appetite are still being studied, and the results are not clear.

In a guideline published in 2023, the World Health Organization (WHO) stated that non-sugar sweeteners are not recommended for weight control. This is not a toxicity warning; it is an assessment that the evidence that they contribute meaningfully to weight loss in the long term is weak.

Who should be careful?

• Children: Because of their low body weight, children who drink many diet drinks over the day can approach the ADI more easily than adults.
• People with diabetes: It does not raise blood sugar directly, but other carbohydrates in the product can. It is important to read the whole label.
• People who want to cut down on sweet foods: Sweeteners can keep a sweet tooth going; water, sparkling mineral water or unsweetened tea are better long-term choices.

What to do when you see it on a label

There is no need to worry about the acesulfame K in an occasional diet drink; compared with a sugary drink, it has advantages in terms of tooth decay and calories. Even so, “sugar-free” should not be equated with “healthy”. If sweetened products make up a large share of your daily diet, the most balanced approach is to replace some of them with plain drinks and minimally processed foods.