Decoding Every Common Food Additive: The Master List

Food additives serve specific technological functions. They are not random inclusions. The main purposes are: preservation (extending shelf life by preventing spoilage), texture modification (emulsification, thickening, stabilizing), color (replacing color lost during processing, or making products visually consistent), flavor enhancement (amplifying taste), and processing aids (helping manufacturing run efficiently, then often absent from or present at low levels in the final product).

Additives become controversial when their technological benefit to the manufacturer exceeds their benefit to the consumer, and especially when safety questions arise around substances that have been in use for decades without rigorous re-evaluation.

The European Union uses a standardized coding system for all approved food additives. The "E" stands for Europe. Each approved substance gets a unique number organized by function:

The EU has authorized roughly 300 substances for use in food. The US recognizes over 3,000 additives — a number that includes kitchen staples like salt and vinegar, but also hundreds of substances with no E-number equivalent.

Seeing an E-number on a label does not automatically mean a substance is unsafe. Many E-numbers cover compounds like ascorbic acid (E300, vitamin C), pectin (E440, derived from fruit), and curcumin (E100, from turmeric). The number is a classification, not a warning.

Preservatives slow or prevent microbial growth and oxidation in foods. Without them, most commercially produced packaged food would have a shelf life measured in days rather than months.

Sorbic acid and potassium sorbate (E200–E203) are among the most widely used, appearing in cheese, wine, baked goods, and dried fruits. Both are considered low-risk by regulatory bodies worldwide.

Sodium benzoate (E211) appears in soft drinks, fruit juices, and pickles. In the presence of vitamin C (ascorbic acid), it can form benzene, a known human carcinogen, in small quantities. This reaction is temperature- and pH-dependent and has been a subject of ongoing monitoring. The FDA has studied this reaction and considers typical dietary exposure levels to be of low concern, though several manufacturers have voluntarily reformulated to avoid the combination.

Sodium nitrite and nitrate (E250, E251) are the most scrutinized preservatives in common use. They cure meat, inhibit Clostridium botulinum, and fix the pink color of processed meats. In the body, nitrites can form nitrosamines, which are carcinogenic. The International Agency for Research on Cancer classified processed meat as a Group 1 carcinogen in 2015, largely on the basis of nitrosamine formation. This does not mean a single serving of bacon causes cancer — it means that the evidence of association is robust at the population level.

BHA (butylated hydroxyanisole, E320) and BHT (E321) are synthetic antioxidants used to prevent rancidity in fats, oils, and fat-containing processed foods. BHA is classified by the IARC as Group 2B ("possibly carcinogenic to humans"). Both have been flagged by the EWG for potential endocrine disruption. Both remain on the US GRAS list.

Food colors are the most politically active category in additive regulation. They serve no nutritional function. Their entire purpose is to make food look more appealing.

Synthetic petroleum-derived dyes are the most contested subset. In 2007, a University of Southampton study published in The Lancet found that a mixture of six synthetic dyes — Sunset Yellow (Yellow 6), Quinoline Yellow, Carmoisine, Allura Red (Red 40), Tartrazine (Yellow 5), and Ponceau 4R — was associated with increased hyperactivity in children. These are commonly called the "Southampton Six." The EU responded by requiring all products containing these dyes to carry the warning: "may have an adverse effect on activity and attention in children." The US FDA reviewed the same evidence in 2011 and did not require warning labels, concluding the evidence was insufficient for a causal claim in the general population.

FD&C Red No. 3 (erythrosine, E127) was banned by the FDA in January 2025 via final order, with a compliance deadline of January 2027. The ban was triggered by the Delaney Clause, which mandates revocation when a substance causes cancer in animals at any dose. Studies showed cancer in male rats at high doses via a rat-specific hormonal mechanism that does not occur in humans — but the Delaney Clause does not allow for mechanistic exceptions.

Caramel color (E150) is the most widely used food color in the world, responsible for the brown in colas, gravies, sauces, and breads. Not all caramel color is the same. Class IV caramel (E150d), made with ammonium sulfite, produces a byproduct called 4-methylimidazole (4-MEI), which the IARC classifies as Group 2B. California's Proposition 65 requires warning labels on products exceeding 29 micrograms of 4-MEI per daily serving.

Emulsifiers allow oil and water to mix, which is why mayonnaise and salad dressings don't separate on the shelf. They are ubiquitous in processed foods.

Lecithin (E322) is derived from soy, sunflower, or eggs and is considered very low risk. It appears in chocolate, margarine, and baked goods.

Mono- and diglycerides of fatty acids (E471) are the most used emulsifiers in bread, ice cream, and margarine. Despite being derived from fats, they are not required to be listed under the nutrition panel's fat content in most jurisdictions — a labeling quirk that affects calorie and fat calculations for people who track them.

Carrageenan (E407) is derived from red seaweed and appears widely in plant milks, deli meats, and dairy products. Preclinical studies have shown it can promote intestinal inflammation, though the evidence in humans at typical food doses is contested. The National Organic Standards Board voted to remove it from the list of allowed organic ingredients in 2016, a decision that was overturned — the debate over its status is ongoing.

Carboxymethylcellulose (CMC, E466) is a synthetic fiber derivative used as a thickener and stabilizer. A randomized controlled trial published in Gastroenterology in 2022 found that CMC consumption over 11 days caused measurable microbiome disruption, reduced levels of health-associated metabolites, increased gut permeability, and in two participants, bacteria invading the normally sterile intestinal mucus layer. A 2024 French cohort study (NutriNet-Santé, n=92,000) found associations between several emulsifiers including CMC and increased risk of certain cancers.

These findings are observational or short-term — they establish association and biological plausibility, not definitive causation. But the scale of the NutriNet-Santé cohort and the direct mechanistic evidence from the CMC trial have made emulsifiers one of the most closely watched additive categories in current food science.

Monosodium glutamate (MSG, E621) is the most well-known flavor enhancer. It amplifies savory taste by stimulating glutamate receptors on the tongue. MSG's reputation was shaped by "Chinese Restaurant Syndrome," a term coined in a 1968 letter to the New England Journal of Medicine describing headaches and chest tightness after Chinese restaurant meals. Controlled trials have not demonstrated that MSG causes these symptoms at typical dietary levels. The FDA classifies MSG as GRAS and considers it safe. Glutamate occurs naturally in parmesan cheese, tomatoes, mushrooms, and soy sauce at concentrations higher than in most MSG-seasoned foods.

"Natural flavors" is not a single additive but a catch-all term covering hundreds of substances derived from plant or animal sources. The FDA definition requires only that the primary function be flavoring and that the substance derive from a natural source — the processing steps used to extract and concentrate it can be extensive. A product labeled "natural flavor" may contain allergen derivatives like milk protein or shellfish extract, which is a particular concern for people with food allergies.

Aspartame (E951) sweetens diet sodas, sugar-free gum, and low-calorie packaged foods. In July 2023, the IARC classified it as Group 2B ("possibly carcinogenic to humans"). Simultaneously, the WHO's Joint Expert Committee on Food Additives (JECFA) maintained its acceptable daily intake at 40 mg/kg of body weight and stated that the data did not sufficiently indicate an association between aspartame and cancer at normal consumption levels. The divergence between IARC's hazard classification and JECFA's risk assessment created significant public confusion. Neither the FDA nor EFSA changed their safety assessments. The IARC Group 2B category also includes aloe vera extract, pickled vegetables, and coffee at very high doses.

Acesulfame-K (E950) is often used in combination with aspartame to mask off-notes. It has been approved since 1988 in the US. Some research has raised questions about its effects on gut microbiome composition, but current regulatory positions in both the US and EU consider it safe at approved levels.

Sucralose (E955) was derived from sugar in a 1970s process involving chlorination. It has been approved in the US since 1998. Some 2023 research identified sucralose-6-acetate as a metabolic byproduct with genotoxic potential in cell studies — findings that prompted calls for further review, though neither the FDA nor EFSA has acted on them.

The most important structural difference between US and EU food additive systems is not the list of approved substances — it is who has to prove safety before a substance enters the food supply.

The EU uses a positive list system: a substance cannot be used in food unless it is explicitly authorized on the EU's Union list. Every additive must pass EFSA review before it can be used. The EU also applies the precautionary principle: if there is scientific uncertainty about safety, the substance can be restricted until the uncertainty is resolved.

The US system centers on the GRAS designation. A substance can enter the food supply in two ways: through a formal FDA petition process (typically 24 months or more), or through the GRAS pathway. Under GRAS, if a manufacturer determines — either through a voluntary notification to the FDA or entirely internally — that qualified experts would recognize the substance as safe, it can begin using it without any formal approval.

The internal route is the controversial one. Known as "self-affirmed GRAS," it allows companies to hire their own experts, make their own safety determination, and add a substance to food products with no public disclosure and no FDA review. The FDA has no comprehensive list of what is in the food supply via this pathway.

The table below shows some of the most-discussed additives that the EU has banned while the US still permits them:

Note the BVO row: the EU banned it in 2008, the FDA banned it in 2024. State-level action from California in 2023 helped accelerate the federal ban — the same dynamic that preceded the FDA's 2025 move on Red 3, which California had already prohibited.

It would be inaccurate to say the EU bans everything the US allows. The EU permits some substances — like certain nitrites in cured meat — at levels the US restricts. And some additives labeled "banned in Europe" are more precisely "banned for most uses, with limited exceptions" or "required to carry a warning label." But the structural difference in who bears the burden of proof — manufacturer or regulator — leads to genuine divergence in what ends up in food.

For a more detailed look at this regulatory gap, the IngrediCheck blog has covered why Europe bans some food additives the US allows in a dedicated post.

The EWG estimates that thousands of substances currently in US food have never been reviewed by the FDA. Manufacturers use the self-affirmed GRAS pathway, notify no one, and the ingredient enters the food supply with no public record.

In 2025, HHS Secretary Robert F. Kennedy Jr. directed the FDA to explore eliminating the self-affirmation pathway, requiring all GRAS claims to go through the formal notification process at minimum. Senator Edward Markey introduced legislation in 2023 that would require FDA notification for all GRAS designations and ban conflict-of-interest panels from conducting safety evaluations. None of these proposals have become law as of May 2026.

The GRAS system was originally designed for substances with long, well-documented histories of safe use, like salt and vinegar. Its extension to novel synthetic additives through the self-affirmation route is the element that critics argue most directly undermines consumer protection.

The NOVA classification system, developed by researchers at the University of São Paulo and endorsed by the FAO, defines ultra-processed foods (Group 4) as industrial formulations that include additives not commonly found in home cooking. The marker of ultra-processing is precisely the additive list: emulsifiers, synthetic colors, artificial flavor enhancers, texture agents, and preservatives used not for safety but to make cheap ingredients taste and look like something better than they are.

A 2024 meta-analysis published in the BMJ, reviewing 45 meta-analyses covering nearly 10 million participants, found that high ultra-processed food consumption was associated with a 50% higher risk of death from cardiovascular disease, a 48% higher risk of anxiety, and a 21% higher risk of early death from any cause. This evidence does not isolate any specific additive as the mechanism. The harm may come from the nutritional displacement effect of UPFs as much as from additives directly. But the additive categories most associated with ultra-processed foods — particularly emulsifiers and synthetic dyes — are also the ones generating the most new safety research.

Reading ingredient lists is easier when you know what you're looking at. Preservatives like potassium sorbate and sorbic acid are low-risk by current evidence. Natural-derived thickeners like pectin and guar gum are generally well-tolerated. Synthetic petroleum-derived dyes, some emulsifiers, and certain preservatives in processed meat carry more substantive evidence of concern.

No single additive at typical dietary levels is likely to be the decisive factor in anyone's health. The pattern that matters is cumulative: a diet heavy in ultra-processed foods exposes you to dozens of these substances simultaneously, in combinations that have rarely been tested together, at frequencies that single-substance studies don't capture.

IngrediCheck lets you scan any packaged food and see every additive in its ingredient list, flagged against its regulatory status across the US, EU, and other jurisdictions. That includes banned substances like titanium dioxide that may still appear in products imported or manufactured before the ban took effect, and additives that carry EU warning requirements but have no equivalent US disclosure.

• How to Spot Corn Syrup: Every Name It Hides Under
• Why Europe Bans Some Food Additives the US Allows
• 44 Food Additives Banned Abroad: The Texas Warning Label List
• Azodicarbonamide: The Yoga Mat Chemical in Your Bread
• Carboxymethylcellulose: The Emulsifier Quietly Linked to Gut Inflammation