E-numbers in food are toxic

What we know

E-numbers are a labeling system introduced by the European Union to identify food additives that have passed safety assessment for use in food, covering categories including preservatives (E200s), antioxidants (E300s), colorings (E100s), and emulsifiers and stabilizers (E400s and above). The system exists to give consumers and manufacturers a consistent, internationally recognized shorthand rather than requiring full chemical names on every label, and an E-number is assigned only after the European Food Safety Authority (EFSA) or its predecessor bodies have reviewed the substance's safety data. Some E-numbers refer to substances most people would consider ordinary and unremarkable, including vitamin C (E300), which is also an antioxidant preservative, and citric acid (E330), found naturally in citrus fruit.

The claim that E-numbers as a category are toxic conflates the existence of a systematic labeling code with the inherent risk of the substances it labels, which vary enormously. Some additives given E-numbers have, in fact, faced restriction or removal following updated safety review, including certain azo dyes such as Sunset Yellow (E110) and Tartrazine (E102), which the European Food Safety Authority linked in a 2007 study conducted at the University of Southampton to modest increases in hyperactivity in some children, prompting the EU to require warning labels on foods containing these specific dyes since 2010. This demonstrates that the regulatory system responds to new evidence for specific substances rather than that all E-numbers are unsafe; the vast majority of approved additives, including common preservatives like ascorbic acid and everyday substances like pectin (E440, found in fruit), have not been linked to comparable concerns.

EFSA continuously re-evaluates approved additives as new research becomes available, a process that led to the 2011 phase-out of several older colorings and the ongoing review of substances like titanium dioxide (E171), which EFSA's expert panel concluded in 2021 could no longer be considered safe as a food additive due to concerns about potential genotoxicity, leading to an EU-wide ban on its use in food starting in 2022. This case is frequently cited by additive safety critics, but it also illustrates that the regulatory system does function as intended: substances are reassessed and withdrawn when evidence warrants it, rather than being permanently grandfathered in regardless of new data.

Toxicologists emphasize the foundational principle that toxicity depends on dose, mechanism, and individual substance rather than on whether something happens to carry an E-number, a coding convention rather than a chemical classification. Comparing E-numbers as a block to 'chemicals' as inherently dangerous, while treating substances without E-numbers as automatically safe, also overlooks that virtually all food, additive-free or not, is composed of chemical compounds, and that naturally occurring substances can be just as toxic as synthetic ones at sufficient doses, while many approved synthetic additives have extensive safety margins built into their permitted usage levels.

The persistent fear of E-numbers appears to stem partly from the unfamiliar, code-like appearance of the labeling system itself, which can make additives seem more mysterious or industrial than descriptive chemical names would, even when the underlying substance, such as ascorbic acid labeled as E300, is one many consumers would recognize and consider benign if named directly as vitamin C.

Common claims

• All E-numbers are toxic synthetic chemicals.False, the E-number system includes many naturally occurring and well-tolerated substances such as vitamin C and citric acid.
• Some specific food dyes with E-numbers have been linked to hyperactivity in children.Partly true, a 2007 Southampton study found modest effects for specific azo dyes, leading to EU warning label requirements.
• Titanium dioxide (E171) was banned as a food additive in the EU.True, EFSA concluded in 2021 it could no longer be considered safe, and the EU banned its use in food from 2022.
• Having an E-number means a substance has not been safety tested.False, E-numbers are only assigned after safety evaluation by EFSA or predecessor bodies.

Evidence hierarchy

All sources

• Food additivesEuropean Food Safety Authority · 2023
• Titanium dioxide, E171, no longer considered safe when used as a food additiveEuropean Food Safety Authority · 2021
• Food colours and hyperactivityUK Food Standards Agency · 2008
• Understanding E numbersBritish Nutrition Foundation · 2022
• Food additives, EU regulation overviewEuropean Commission · 2023

Related terms