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Is acesulfame potassium safe? Rules in the US, Canada and EU, and what the studies say

Artificial sweetener · Also known as: Ace-K, Acesulfame K, Acesulfame-K, E 950, E950, 6-methyl-1,2,3-oxathiazin-4(3H)-one-2,2-dioxide potassium salt, CAS 55589-62-3 · Reviewed Oct 20, 2026 · 16 sources

Quick answerAcesulfame potassium (Ace-K, E 950) is permitted in the United States, Canada and the European Union, with food-by-food limits in the last two. In April 2025 EFSA set an acceptable daily intake of 15 mg per kg of body weight (up from 9) and found no safety concern at the reported uses and use levels. Some large French observational studies link higher intake to coronary heart disease, cancer and type 2 diabetes, but EFSA, weighing the human and animal evidence together, judged such links unlikely.

Where acesulfame potassium is allowed

United States

Permitted

The FDA approved Ace-K in 1988 for specific food and drink categories and in 2003 as a general-purpose sweetener and flavor enhancer in food except meat and poultry. 21 CFR 172.800 requires good manufacturing practice and a purity of at least 99%. The FDA lists the acceptable daily intake as 15 mg per kg of body weight per day. [1, 2]

As of 2026-10

Canada

Permitted with conditions

Ace-K is on Health Canada's List of Permitted Sweeteners with maximum levels by food, for example 250 ppm in unstandardized carbonated beverages, 1,000 ppm in unstandardized bakery products and 5,000 ppm in chewing gum. Tabletop sweeteners are limited only by good manufacturing practice. [3]

As of 2026-10

European Union

Permitted with conditions

E 950 is authorised only in listed food categories, mostly energy-reduced or no-added-sugar products, with maximum levels such as 350 mg/l in flavoured drinks and 500 mg/kg in confectionery with no added sugar; tabletop sweeteners have no numerical cap. EFSA published its re-evaluation of E 950 in April 2025. On 10 September 2026 EFSA announced that its re-evaluation of the aspartame-acesulfame salt (E 962), adopted in July 2026, also found no safety concern at current uses. [4, 5, 6, 7]

As of 2026-10

What is acesulfame potassium?

Acesulfame potassium, usually shortened to Ace-K, is a zero-calorie sweetener that the FDA describes as about 200 times sweeter than table sugar and often combined with other sweeteners. EFSA calls it a chemically manufactured potassium salt and found the body absorbs it almost completely, does not metabolise it, and mainly excretes it in urine.

Why it's used, and where you'll find it

Ace-K sweetens without calories, and the FDA notes it stays sweet at baking temperatures. Drinks matter most: EFSA found flavoured drinks to be the main source of exposure in every population group. Health Canada allows up to 250 ppm in unstandardized carbonated beverages, and the EU up to 350 mg per litre in flavoured drinks that are energy-reduced or have no added sugar.

  • diet and zero-sugar soft drinks
  • chewing gum
  • sugar-free confectionery and breath mints
  • tabletop sweetener packets
  • yogurt and dairy desserts
  • baked goods

What the research and regulators say

What EFSA concluded in 2025

EFSA found no genotoxicity concern for Ace-K or its degradation products. It set an ADI of 15 mg per kg of body weight per day, based on the highest dose with no adverse effects in a two-year rat study, replacing the 9 mg figure set by the EU's Scientific Committee on Food. JECFA's ADI is also 0-15 mg per kg, from its 1990 evaluation (37th meeting). EFSA rated the human evidence on cancer and on cardiovascular risk factors and disease as low in level. Combining human and animal evidence, it judged an association with cancer, cardiovascular disease, disturbed glucose or insulin control, or kidney and liver toxicity unlikely. It could not conclude on preterm delivery or early puberty in girls. It also asked the Commission to consider tighter limits for lead and mercury and limits for two impurities, including 5-chloro-acesulfame, which computer screening flagged and for which no experimental toxicity data exist. [4, 5, 8]

How much people actually consume

EFSA's refined estimates, for people who consume the products, put average intake between 0.04 mg per kg of body weight per day (adolescents) and 5.2 (toddlers). The 95th-percentile figure for toddlers was 15.7, slightly above the ADI of 15. EFSA described its estimates as likely to overestimate real exposure, said the 95th-percentile figures were generally below the ADI, and concluded that current exposure estimates do not indicate a safety concern. [5]

The French cohort studies

The NutriNet-Sante cohort follows about 100,000 French adults, with intake estimated from repeated 24-hour food records. A 2022 BMJ paper linked higher Ace-K intake to more coronary heart disease (hazard ratio 1.40, 95% confidence interval 1.06 to 1.84). A 2022 PLoS Medicine paper reported higher cancer risk in higher consumers (1.13, 1.01 to 1.26), and a 2023 Diabetes Care paper higher type 2 diabetes risk (1.70, 1.42 to 2.04). These observational studies cannot show cause; the diabetes authors say reverse causality cannot be ruled out. EFSA included all three. It noted that the BMJ paper found no statistically significant link with cardiovascular disease overall when intake was modelled continuously (1.18, 0.98 to 1.41), and treated each finding as a single observational result that would need confirming: for cancer, one study with volunteer-selection bias; for coronary heart disease, one study; for type 2 diabetes, one study with no clear biological explanation, set against short-term trials showing no effect on glucose or insulin. [5, 9, 10, 11]

Animal studies and WHO's 2023 advice

In CD-1 mice, four weeks of Ace-K changed the gut microbiome and increased weight gain in males but not females; in mice prone to artery plaque on a high-cholesterol diet, it worsened blood fats and plaque. These are early animal findings. Separately, WHO's 2023 guideline recommends against using non-sugar sweeteners, a group that includes acesulfame K, to control body weight or reduce the risk of noncommunicable diseases. WHO calls this a conditional recommendation, because the links between sweeteners and disease in the evidence might be confounded. It cites a review that found no long-term body-fat benefit and possible increases in type 2 diabetes, cardiovascular disease and mortality, and excludes people with pre-existing diabetes. WHO says it is not a safety assessment and does not replace JECFA's intake limits. IARC's List of Classifications (updated July 2026) has no entry for Ace-K. [12, 13, 14, 15, 16]

Who might choose to avoid it

No regulator singles out a group that must avoid Ace-K. Some people choose to limit products sweetened with it because EFSA could not conclude on preterm delivery or early puberty in girls, because toddlers had the highest estimated intake relative to body weight, or because of the observational studies or WHO's advice.

How to spot it on a label

Look for 'acesulfame potassium', 'acesulfame K', 'Ace-K' or, on European labels, 'E 950'. It usually sits next to other sweeteners; the combined EU salt appears as 'salt of aspartame-acesulfame' (E 962).

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Frequently asked questions

Is acesulfame potassium banned in Europe?

No. E 950 is authorised under Regulation (EC) No 1333/2008 in listed foods with maximum levels. In April 2025 EFSA raised its ADI from 9 to 15 mg per kg of body weight per day and found no safety concern at current exposure estimates.

Is acesulfame potassium safe?

The FDA, Health Canada and EFSA all permit it, and the FDA and EFSA both list an ADI of 15 mg per kg of body weight per day. Observational studies report associations with some diseases, but EFSA judged those links unlikely after weighing all the evidence.

Does acesulfame potassium cause cancer?

EFSA found no genotoxicity concern and judged a link to cancer unlikely, though it rated the human evidence as low. One French cohort study reported a modestly higher cancer risk in higher consumers (hazard ratio 1.13, 95% confidence interval 1.01 to 1.26), which shows association, not cause; EFSA noted it was a single study with volunteer-selection bias. IARC has no entry for it.

Is acesulfame potassium the same as aspartame?

No. They are different compounds with different EU ADIs (15 mg per kg for Ace-K, 40 mg for aspartame). They can be joined in one salt, E 962. EFSA announced in September 2026 that its re-evaluation of that salt found no safety concern at current uses.

How much acesulfame potassium is too much?

Regulators use an acceptable daily intake (ADI) as the benchmark. The FDA, JECFA and EFSA all give 15 mg per kg of body weight per day for Ace-K. EFSA's average intake estimates were at most 5.2 (for toddlers), and its 95th-percentile estimate for toddlers was 15.7.

Related ingredients

Sources

  1. U.S. FDA — Aspartame and Other Sweeteners in Food (accessed 2026-10-20)
  2. eCFR (U.S. Government) — 21 CFR 172.800 - Acesulfame potassium (accessed 2026-10-20)
  3. Health Canada — 9. List of Permitted Sweeteners (Lists of Permitted Food Additives) (accessed 2026-10-20)
  4. EFSA — Re-evaluation of acesulfame K (E 950) as food additive (plain-language summary) (accessed 2026-10-20)
  5. EFSA Journal (via PubMed Central) — Re-evaluation of acesulfame K (E 950) as food additive (EFSA Journal 2025;23(4):e9317, published 30 April 2025) (accessed 2026-10-20)
  6. EUR-Lex (European Union) — Regulation (EC) No 1333/2008 on food additives, consolidated text of 18.08.2026 (Annex II, Part E) (accessed 2026-10-20)
  7. EFSA — EFSA concludes the salt of aspartame-acesulfame (E 962) is safe at current exposure levels (accessed 2026-10-20)
  8. WHO (JECFA database) — JECFA Evaluations - Acesulfame potassium (accessed 2026-10-20)
  9. PubMed (U.S. National Library of Medicine) — Artificial sweeteners and risk of cardiovascular diseases: results from the prospective NutriNet-Sante cohort (Debras et al., BMJ 2022, PMID 36638072) (accessed 2026-10-20)
  10. PubMed (U.S. National Library of Medicine) — Artificial sweeteners and cancer risk: Results from the NutriNet-Sante population-based cohort study (Debras et al., PLoS Med 2022, PMID 35324894) (accessed 2026-10-20)
  11. PubMed (U.S. National Library of Medicine) — Artificial Sweeteners and Risk of Type 2 Diabetes in the Prospective NutriNet-Sante Cohort (Debras et al., Diabetes Care 2023, PMID 37490630) (accessed 2026-10-20)
  12. PubMed (U.S. National Library of Medicine) — The artificial sweetener acesulfame potassium affects the gut microbiome and body weight gain in CD-1 mice (Bian et al., PLoS One 2017, PMID 28594855) (accessed 2026-10-20)
  13. PubMed (U.S. National Library of Medicine) — Consumption of Non-Nutritive Sweetener, Acesulfame Potassium Exacerbates Atherosclerosis through Dysregulation of Lipid Metabolism in ApoE-/- Mice (Lin et al., Nutrients 2021, PMID 34836239) (accessed 2026-10-20)
  14. World Health Organization — WHO advises not to use non-sugar sweeteners for weight control in newly released guideline (accessed 2026-10-20)
  15. IARC — List of Classifications (IARC Monographs on the Identification of Carcinogenic Hazards to Humans; data last updated 2026-07-23) (accessed 2026-10-20)
  16. World Health Organization — Use of non-sugar sweeteners: WHO guideline (accessed 2026-10-20)

This page summarizes what regulators and published research say, as of the review date above. Rules and evidence change; check the linked sources for the latest. It is general information, not medical advice — talk to a doctor or pharmacist about your own health.