Is sucralose bad for you?
Yes, sucralose is one of the additives worth limiting. A zero-calorie sweetener made by chlorinating sugar. A 2022 randomized trial found it altered gut bacteria and impaired blood-sugar response in healthy adults, a manufacturing impurity has flagged DNA-damage signals, and EFSA itself declined in 2026 to clear it for baking because it can break down at high heat.
Is sucralose actually harmful?
Most of it passes through your gut unabsorbed. But a 2022 randomized controlled trial in healthy adults, at doses below the daily limit, found sucralose shifted the gut microbiome and measurably impaired glycemic response — one of the few times this has been shown in people rather than mice. Separately, sucralose-6-acetate, present both as a manufacturing impurity and as a gut breakdown product, has shown genotoxic (DNA-breaking) signals in laboratory cell assays; that work is contested and has not been replicated in humans. And under prolonged high heat, as in baking or frying, sucralose can degrade into chlorinated compounds. Regular daily users, and anyone baking with it, carry the most exposure.
What do regulators say?
EFSA's February 2026 re-evaluation confirmed sucralose is safe at currently authorised uses and kept the acceptable daily intake at 15 mg per kg of body weight per day, with exposure below that in all population groups. Notably, EFSA could NOT confirm safety for the proposed extension into fine bakery wares, citing uncertainty about chlorine transferring to other molecules under prolonged high temperatures — a caution that also applies to home baking and frying. The FDA approves it as GRAS. WHO's 2023 guideline advises against sweeteners for weight control.
Source: EFSA — re-evaluation of sucralose (E 955), February 2026 ↗So should you avoid it?
Known or suspected to cause harm: a substance EFSA or another regulator has flagged, or one restricted in some jurisdictions. Best kept out of a regular diet.
For the full reference on sucralose, including what it is and where it turns up, see the E955 page. Or scan a product and Yuzu tells you if it's inside.