Home › Ingredients › Acesulfame K (E950)
Is acesulfame K (E950) safe?
- EFSA (2025): re-reviewed it and raised the safe limit from 9 to 15 mg/kg — no safety concern
- FDA & FSSAI: permitted; same 15 mg/kg daily limit
- WHO (2023): advises against using it — or any sweetener — for weight control
- LabelCop: flags E950 on every label — strictest standard wins
What is acesulfame K?
- An artificial sweetener — about 200 times sweeter than sugar, with no calories
- Heat-stable, so it survives baking and cooking (unlike aspartame)
- Often blended with sucralose or aspartame to mask a slightly bitter aftertaste
- Label names: acesulfame K, acesulfame potassium, Ace-K, E950, INS 950
Which foods contain it?
- Diet, zero and "no added sugar" soft drinks
- Sugar-free chewing gum and mints
- Protein powders, protein bars and meal-replacement shakes
- Flavoured waters, sugar-free squashes and cordials
- Sugar-free yoghurts, jellies, desserts and table-top sweeteners
- In India: common in diet soft drinks, sugar-free mithai and "zero sugar" packaged drinks — look for INS 950 on the label, often alongside INS 955 (sucralose)
What the regulators actually say
| Regulator | Status | Reasoning |
|---|---|---|
| EFSA / European Union | Permitted — limit raised 2025 | EFSA re-evaluated E950 in April 2025 (its first review since 2000) and found no safety concern. It raised the acceptable daily intake from 9 to 15 mg per kg of body weight per day. It found no genotoxicity concern for the sweetener, but recommended a tighter purity limit on one impurity, 5-chloro-acesulfame. |
| FDA (United States) | Permitted since 1988 | Approved as a general-purpose sweetener and flavour enhancer. The FDA sets an acceptable daily intake of 15 mg per kg of body weight per day — roughly the amount in many litres of diet drink for an adult. |
| FSSAI (India) | Permitted in specified foods | One of six artificial sweeteners approved in India, with maximum limits per food category set from the JECFA daily intake. FSSAI explicitly does not endorse it for weight loss or for blood-sugar control in diabetes. |
| WHO / JECFA | Safe to eat — but "don't use for weight control" | JECFA has long accepted a 15 mg/kg daily intake. Separately, the WHO's 2023 guideline advises against using non-sugar sweeteners, including acesulfame K, to control weight — the evidence shows no long-term weight benefit and a possible link to type 2 diabetes and heart disease. |
| UK, Canada, Australia | Permitted | All permit E950 at the same 15 mg/kg daily intake, harmonised with JECFA and Codex. |
Why do regulators disagree?
- They're answering two different questions. Safety agencies ask "is it toxic at normal intake?" — the answer is no
- The WHO asks a health-outcomes question: "does using it actually help?" — and the evidence says no long-term weight benefit
- EFSA even relaxed its limit in 2025 — more data, higher confidence it isn't harmful at dietary doses
- The open science: animal studies have linked Ace-K to gut-bacteria changes, and a 2023 study found it can cross the placenta — early signals, not confirmed human harm
- So "legal and safe" and "good for you" aren't the same thing — we show you both readings instead of quietly picking one
- Acesulfame K is a high-risk flag in LabelCop
- Rule: strictest standard wins — the WHO's advice against non-sugar sweeteners means we flag it even though it's legal everywhere
- The product's score takes a penalty — and you see the flag, the reason and the sources. No black box, no scare tactics
Frequently asked questions
Is acesulfame K banned anywhere?
No. It's permitted by the FDA, EFSA, FSSAI and JECFA. In April 2025 EFSA re-reviewed it and raised the safe daily intake from 9 to 15 mg per kg of body weight.
Why does the WHO advise against it if regulators say it's safe?
Different questions. Safety regulators find it isn't toxic at normal intake. The WHO's 2023 guideline asks whether non-sugar sweeteners help health, and found they don't aid long-term weight loss and may carry risks. "Safe to eat" and "helpful" aren't the same.
Which label names should I look for?
Acesulfame K, acesulfame potassium, Ace-K, E950 or INS 950 — most common in diet drinks, sugar-free gum, protein products and "no added sugar" foods.
Is acesulfame K linked to cancer?
No regulator classifies it as a cancer risk. EFSA's 2025 review found no genotoxicity concern for the sweetener itself; it only asked for a tighter purity limit on one manufacturing impurity.
How do I avoid it?
Read the ingredients list for the names above — or scan the label with LabelCop and it's flagged automatically, with the regulator reasoning shown.
LabelCop reads any food label you photograph and flags additives like E950 instantly — no barcode needed.
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EFSA (2025): Re-evaluation of acesulfame K (E 950) as a food additive · FDA: Aspartame and other sweeteners in food · WHO (2023): advises not to use non-sugar sweeteners for weight control · FSSAI: note on non-sugar sweeteners
Related ingredients: Sucralose (E955) · Aspartame (E951) · High-fructose corn syrup
This article explains regulatory status and published scientific assessments in plain English. It is not medical advice.