The Dirty Dozen: 12 Food Additives to Watch

The FDA revoked authorization for Red No. 3 in January 2025 — 35 years after its own scientists flagged thyroid tumor risk in male rats. The delay was the result of a legal loophole (the Delaney Clause) that took decades to enforce. It remains in food products through a compliance timeline extending to 2027.

The most widely used synthetic food dye in the United States. The EU requires foods containing Red 40 to carry a warning: 'may have an adverse effect on activity and attention in children.' The FDA reviewed the same data and concluded current evidence is insufficient to establish a causal link with ADHD at typical dietary exposure. Multiple US states are pursuing labeling or ban legislation as of 2025.

The EU banned titanium dioxide as a food additive in August 2022, citing EFSA's 2021 conclusion that it could no longer be considered safe due to genotoxicity concerns — specifically, the ability to damage DNA. The FDA continues to allow it under its GRAS status, asserting insufficient evidence of harm at current dietary exposure levels. It is used as a whitening agent.

Classified as a possible human carcinogen (Group 2B) by the International Agency for Research on Cancer (IARC). Banned for use in flour in the EU, UK, Canada, Brazil, China, and India. The FDA has not banned it but advises bakers not to use it. California requires a Proposition 65 cancer warning on bread containing potassium bromate.

Banned in the EU, Australia, and Singapore. The WHO has linked azodicarbonamide to respiratory issues in occupational settings — workers in flour facilities exposed to its dust have developed asthma. When baked, it degrades into urethane (a carcinogen) and semicarbazide. The FDA permits up to 45 ppm in flour; EFSA determined the risk from semicarbazide was not acceptable at any level.

Listed as 'reasonably anticipated to be a human carcinogen' by the National Toxicology Program (NTP) since 2011 — a designation the FDA has not acted on. Animal studies show BHA causes forestomach tumors in rats, mice, and hamsters. The EU permits BHA at lower levels than the US and restricts it to specific applications. California lists it under Proposition 65.

Frequently used alongside BHA. Evidence on BHT is more mixed than BHA — some studies suggest it may inhibit tumor formation while others show promotion effects depending on dose and species. NTP classifies it as 'not adequately studied' for carcinogenicity. Restricted but not banned in the EU. Banned from food use in Japan.

Sodium nitrite is a preservative that prevents botulism in cured meats but forms nitrosamines — recognized carcinogens — when exposed to high heat or stomach acid. The IARC classifies processed meat (which relies heavily on nitrites) as a Group 1 carcinogen. The FDA continues to permit its use within concentration limits. Nitrite intake from processed meat is associated with colorectal cancer risk in large epidemiological studies.

The EU requires foods containing Yellow 5 to display a warning that it 'may have an adverse effect on activity and attention in children.' This requirement stems from a 2007 University of Southampton study and subsequent EFSA review linking a mix of six synthetic dyes (including Yellow 5) to increased hyperactivity in children. The FDA reviewed the same data and concluded evidence was insufficient for mandatory labeling. Yellow 5 also causes allergic reactions in aspirin-sensitive individuals.

Covered by the same EU hyperactivity warning as Yellow 5. Yellow 6 has also been found to contain trace contaminants including benzidine, a known human carcinogen, as a manufacturing byproduct. The FDA's acceptable tolerance for such contaminants is 10 ppb; EFSA has expressed concern that even trace levels of genotoxic carcinogens do not have a threshold effect.

The FDA removed propyl paraben from its GRAS list for use in tortillas in 2017, marking one of the rare instances where the agency acted on an endocrine disruption concern. Studies have shown propyl paraben disrupts estrogen signaling and reduces sperm count and testosterone levels in animal models. The EU prohibits it in all foods (E216). Denmark banned it entirely before the EU-wide prohibition.

The FDA revoked authorization for brominated vegetable oil in July 2024 after decades of use in citrus-flavored beverages. Studies in animals showed BVO accumulates in fat tissue and organs, causing damage to the heart, liver, and thyroid. The EU, UK, India, and Japan had already banned it years earlier. PepsiCo and Coca-Cola removed BVO from their drinks in 2013 following consumer pressure; some regional brands continued using it until the FDA acted.