Regulators Reaffirm Sucralose Safety Despite 2023 DNA Damage Concerns

Key points

• In 2023, researchers at North Carolina State University reported that sucralose-6-acetate, an impurity found in up to 0.67% of commercial sucralose samples, caused DNA breaks and disrupted gut barrier integrity in laboratory experiments.
• The 2023 study suggested that trace amounts of this compound in a single sweetened drink could exceed the European threshold of toxicological concern for genotoxic substances, prompting calls to reconsider sucralose’s safety status.
• In February 2026, the European Food Safety Authority (EFSA) conducted a comprehensive reassessment and concluded that sucralose remains safe, maintaining its acceptable daily intake at 15 milligrams per kilogram of body weight.
• EFSA noted that the 2023 findings were based on in vitro experiments and did not establish that ordinary consumption causes DNA damage in humans, and that the compounds detected in earlier rat studies might have been pre-existing impurities rather than metabolites.
• A 2026 study in Food and Chemical Toxicology found no significant genotoxicity in commercial-grade sucralose, though it noted some DNA damage signals in a comet assay, which the authors deemed inconclusive.

Background

This story follows earlier concerns about artificial sweeteners, including reports that sucralose and stevia may alter gut microbiota in mice and that sorbitol could be converted to fructose in the liver. Additionally, previous studies have linked sucralose to increased appetite and hypothalamic blood flow in humans, though these effects are distinct from DNA damage claims.

Why it matters

The debate over sucralose’s safety highlights the gap between laboratory findings and real-world health risks. While the 2023 study raised alarms about potential DNA damage, subsequent regulatory reviews and independent studies have not confirmed that everyday consumption poses a significant health hazard. This case underscores the importance of context in interpreting toxicological data and the role of regulatory bodies in balancing precaution with scientific evidence.

What to watch

Regulators will continue to monitor sucralose’s safety, particularly regarding its use in high-temperature applications like baking, where chlorine-containing compounds may form. Further research may explore the long-term metabolic effects of sucralose, including its impact on appetite and glucose regulation, but current evidence supports its continued use as a food additive.