Sucralose (E955)

What is Sucralose?

Sucralose is a synthetic sweetener made from ordinary table sugar: three hydroxyl groups on the sucrose molecule are replaced with chlorine atoms. The result is about 600 times sweeter than sugar, tastes clean rather than bitter, and passes through the body largely unabsorbed, so it contributes essentially no calories.

In the US it appears on labels simply as sucralose, and in the retail packet as Splenda — though branded packets also contain bulking agents such as maltodextrin or dextrose, which is why a packet does have a few calories. In Europe it is E 955.

Why is Sucralose used in food?

Sucralose is the workhorse sweetener of "zero sugar", "diet", "light" and "keto" products: soft drinks, flavored waters, protein powders and bars, yogurt, syrups, chewing gum and tabletop sweeteners. Two properties explain its popularity. It is far more heat- and acid-stable than aspartame, so it survives pasteurization and long shelf lives; and because it is so intensely sweet, a tiny amount does the job.

It is often blended with acesulfame potassium (Ace-K) or stevia, because mixtures round out the aftertaste that each sweetener has on its own.

Is Sucralose safe? What the research says

What regulators say. FDA approved sucralose for 15 food categories in 1998 and as a general-purpose sweetener in 1999, after reviewing more than 110 studies on toxicity, carcinogenicity, reproduction and metabolism. FDA's acceptable daily intake (ADI) is 5 mg per kg of body weight per day. EFSA and the WHO/FAO expert committee (JECFA) use a higher figure, 15 mg/kg.

The 2026 EFSA re-evaluation. In February 2026 EFSA published its most thorough review of sucralose in two decades (EFSA Journal 2026;24:9854) and concluded there was no reason to change the ADI of 15 mg/kg. Estimated dietary exposure in the EU was below the ADI in every population group. EFSA did not confirm safety for one proposed new use — sucralose in fine bakery wares — because of an unresolved question about whether chlorine can transfer from sucralose to other molecules under prolonged high-temperature conditions. EFSA noted this uncertainty applies to home baking and frying as well, and recommended tightening the purity specifications for chlorinated impurities.

Sucralose-6-acetate. A 2023 laboratory study (Schiffman et al., Journal of Toxicology and Environmental Health, Part B) reported that sucralose-6-acetate, an impurity and metabolite, was genotoxic in cell-based assays. These were in vitro tests, not studies in people, and they have not changed any regulator's position; EFSA's 2026 review covered the available genotoxicity data and kept the ADI unchanged.

Blood sugar and gut bacteria. A 2022 randomized trial in Cell (Suez et al.) gave 120 healthy adults sachets of saccharin, sucralose, aspartame or stevia for two weeks at doses below the ADI. Sucralose and saccharin measurably worsened glucose responses in some participants, and the effect tracked with changes in gut bacteria — transferring participants' microbiomes into germ-free mice reproduced their donors' glucose patterns. The trial was small and short, and responses varied a lot between individuals; it suggests that "no effect on blood sugar" may not be true for everyone, not that sucralose is harmful.

Weight control. In 2023 the WHO issued a conditional recommendation against using non-sugar sweeteners, including sucralose, as a way to control body weight or reduce the risk of chronic disease — the long-term benefit did not hold up in the evidence. WHO itself notes the observational data may be confounded, and the guideline is not a safety warning.

Bottom line: regulators worldwide consider sucralose safe at the amounts people actually consume, and it is not on FDA's list of chemicals under post-market review. The genuinely open questions are about heating it to high temperatures and about individual variation in blood-sugar response.

Sucralose regulation: US vs EU

Sucralose is one of the least contested additives on this site: it is permitted in the US, the EU, the UK, Canada, Australia and New Zealand, and no state law or federal proposal currently restricts it. The most recent regulatory event was EFSA's February 2026 re-evaluation, which kept the ADI at 15 mg/kg and left open the safety of a proposed extension of use into fine bakery wares. Check the latest status: rules can change.

Who should limit or avoid Sucralose?

• People tracking blood sugar closely. The 2022 trial suggests glucose responses to sucralose differ from person to person. If you use a glucose monitor, you can check your own response directly.
• Anyone baking or frying with it. EFSA flagged uncertainty about prolonged high-temperature heating. If you bake often with a sucralose-based sweetener, a different sweetener is a reasonable choice until that question is settled.
• People using sweeteners for weight loss. WHO's advice is that non-sugar sweeteners do not deliver long-term weight benefit. Swapping soda for sucralose soda still cuts sugar, but it is not a weight-loss strategy on its own.
• Anyone with digestive sensitivity. Sucralose itself is used in tiny amounts, but the bulking agents in tabletop packets (maltodextrin, dextrose) and the sugar alcohols it is often blended with can cause bloating.