Understanding E-Numbers: The Complete Classification Guide

Walk down any supermarket aisle in Europe or Australia, and you will encounter E-numbers on virtually every packaged food. These codes, from E100 to well beyond E1000, are the European Union's standardized numbering system for food additives. Each number represents a substance that has been evaluated and approved for use in food by the European Commission, based on safety assessments from the European Food Safety Authority (EFSA). Yet for many consumers, E-numbers remain opaque, sometimes even frightening. This guide breaks down the entire system so you can read any ingredient list with confidence.

What E-Numbers Actually Are

The "E" stands for "Europe," indicating that the additive has been assessed and approved under EU food safety regulations. An E-number is not a judgment of safety or danger. It is simply a classification code. Some E-numbers represent substances that are entirely natural and uncontroversial, such as E300 (ascorbic acid, or vitamin C). Others represent synthetic compounds that are subject to ongoing scientific debate. The system was established under EU Regulation (EC) No 1333/2008 and is maintained by EFSA, which periodically re-evaluates approved additives based on new scientific evidence.

Importantly, many countries outside Europe use the same numbering system, including Australia, New Zealand, and countries in the Middle East and Asia. The United States does not use E-numbers on food labels but approves many of the same substances under different naming conventions. You can look up any additive's E-number and its global regulatory status in our E-number directory.

E100-E199: Colors

This range covers substances that add or restore color in food. It includes both natural and synthetic colorants. Some of the most well-known and most debated food additives fall here.

E100 (Curcumin) is the natural yellow pigment extracted from turmeric. It is widely considered safe and is used in mustards, dairy products, and rice dishes.
E120 (Cochineal / Carmine) is a natural red dye derived from scale insects. It is safe for most people but can cause allergic reactions in rare cases, and it is not suitable for vegans.
E129 (Allura Red AC) is a synthetic red dye that is one of the most widely used food colorants globally. It is one of the Southampton Six dyes linked to hyperactivity in children, and it requires a warning label in the EU.
E171 (Titanium Dioxide) was banned as a food additive in the EU in 2022 following an EFSA assessment that concluded genotoxicity could not be ruled out. It remains legal in the US, though some manufacturers have voluntarily removed it.

E200-E299: Preservatives

Preservatives prevent microbial growth and spoilage, playing a critical role in food safety. Without them, many foods would have drastically shorter shelf lives, and foodborne illness rates would be substantially higher.

E200 (Sorbic Acid) is one of the safest preservatives available, widely used in cheese, wine, and baked goods. It has very low toxicity and is metabolized by the body like a fatty acid.
E211 (Sodium Benzoate) is effective against yeasts and molds and is commonly found in soft drinks and condiments. Its combination with ascorbic acid can form small amounts of benzene, which has prompted reformulation by several major beverage manufacturers.
E250 (Sodium Nitrite) prevents the growth of Clostridium botulinum in cured meats, making it essential for food safety. However, it can form carcinogenic nitrosamines during high-heat cooking, which is why the IARC considers processed meats a Group 1 carcinogen.
E280-E283 (Propionates) are naturally occurring preservatives found in Swiss cheese. They are widely used in bread to prevent mold growth and are generally considered safe.

E300-E399: Antioxidants and Acidity Regulators

This range includes substances that prevent oxidation (which causes rancidity and browning) and those that regulate the acidity of foods.

E300 (Ascorbic Acid) is vitamin C. It is used as an antioxidant in juices, canned fruits, and meat products. It is one of the clearest examples of a beneficial E-number.
E306-E309 (Tocopherols) are forms of vitamin E, used as natural antioxidants in oils and fats. These are nutritionally beneficial.
E330 (Citric Acid) occurs naturally in citrus fruits and is one of the most widely used food additives in the world. It adjusts acidity, enhances flavor, and acts as a preservative. It has an excellent safety record.
E320 (BHA) and E321 (BHT) are synthetic antioxidants used in fats, oils, and cereals. They are more controversial; BHA is classified as a possible carcinogen by the IARC, and both are flagged as potential endocrine disruptors.

E400-E499: Thickeners, Stabilizers, and Emulsifiers

These additives modify the texture and consistency of food. Many are derived from natural sources such as seaweed, tree sap, and seeds.

E400-E405 (Alginates) are extracted from brown seaweed and are used as thickeners in ice cream, salad dressings, and dairy desserts. They are generally well-tolerated.
E407 (Carrageenan), also from seaweed, is used widely in dairy products and plant-based milks. It has been the subject of debate, with some animal studies suggesting intestinal inflammation, though regulatory bodies maintain it is safe at current usage levels.
E412 (Guar Gum) is derived from guar beans and is a common thickener in sauces, ice cream, and gluten-free baked goods.
E415 (Xanthan Gum) is produced by bacterial fermentation and is ubiquitous in salad dressings, sauces, and gluten-free baking. It has an excellent safety profile.

E500-E599: pH Regulators and Anti-Caking Agents

This range includes acids, bases, and salts used to adjust acidity, as well as agents that prevent powders from clumping.

E500 (Sodium Bicarbonate) is ordinary baking soda. It is one of the oldest and most familiar food additives.
E503 (Ammonium Carbonate) is used as a leavening agent in flat baked goods such as crackers and cookies.
E551 (Silicon Dioxide) is an anti-caking agent found in spice mixes, powdered foods, and supplements. It passes through the body unabsorbed and is considered safe.

E600-E699: Flavor Enhancers

The most famous member of this group needs no introduction.

E621 (Monosodium Glutamate, MSG) is the sodium salt of glutamic acid, an amino acid found naturally in tomatoes, Parmesan cheese, and soy sauce. Despite decades of public concern, systematic reviews and meta-analyses, including a comprehensive review by EFSA in 2017, have consistently found that MSG is safe for the general population at typical dietary levels. The JECFA has not set an ADI, which is reserved for substances with no safety concerns at current intake levels.
E627, E631, and E635 are ribonucleotides that enhance umami flavor and are often used alongside MSG. They have good safety profiles but should be avoided by individuals with gout due to their purine content.

E700-E799: Antibiotics

This range was reserved for antibiotic additives used in animal feed. The EU banned the use of antibiotics as growth promoters in animal feed in 2006, so this range is largely historical within the European system. The concern about antibiotic resistance in food production remains relevant globally, but it falls more under veterinary and agricultural regulation than food additive law.

E900-E999: Glazing Agents, Gases, and Sweeteners

This is a diverse range covering surface treatments, packaging gases, and intense sweeteners.

E900 (Dimethylpolysiloxane) is an anti-foaming agent used in cooking oils, particularly in fast food fryers. It is used in very small quantities and is considered safe.
E901 (Beeswax) is a natural glazing agent used on fruits, confectionery, and pharmaceutical tablets.
E951 (Aspartame) is an intense sweetener approximately 200 times sweeter than sugar. In 2023, the IARC classified it as "possibly carcinogenic to humans" (Group 2B), while the JECFA reaffirmed its existing ADI of 40 mg/kg/day, concluding that typical consumption levels are safe. The divergent assessments reflect different methodological approaches, not contradictory science.
E955 (Sucralose) is a non-caloric sweetener approximately 600 times sweeter than sugar. It has a strong safety record, though some recent studies have raised questions about its effects on gut microbiota.

E1000 and Above: Additional Additives

This open-ended range accommodates newer additives that did not fit neatly into earlier categories.

E1105 (Lysozyme) is a naturally occurring enzyme found in egg whites, used as a preservative in aged cheeses. It is safe but not suitable for those with egg allergies.
E1442 (Hydroxypropyl Distarch Phosphate) is a modified starch used as a thickener in sauces, soups, and dairy products. Modified starches are generally well-tolerated.
E1520 (Propylene Glycol) is used as a solvent for food colorings and flavorings. It is considered safe at food-use levels, though it is the same chemical used in some antifreeze formulations, which understandably alarms consumers despite the different concentrations involved.

Common Misconceptions About E-Numbers

"All E-numbers are chemicals." True in the literal sense that everything is a chemical, but misleading. Many E-numbers are natural substances: E330 is citric acid from citrus fruits, E300 is vitamin C, E160a is beta-carotene from carrots, and E500 is baking soda.

"More E-numbers means a worse product." Not necessarily. A product containing E300 (vitamin C), E330 (citric acid), and E412 (guar gum) has three E-numbers but only innocuous, well-studied ingredients. Conversely, a product with a single controversial additive could be more concerning than one with five safe E-numbers.

"Natural additives are always safer than synthetic ones." Not always. E120 (cochineal) is natural but causes allergic reactions in some people. E951 (aspartame) is synthetic but has been studied in over 100 scientific studies and is approved by every major food safety authority in the world.

How to Use This Knowledge

The best approach is to learn the major categories and the handful of additives that are genuinely controversial, rather than trying to memorize hundreds of numbers. Use our E-number lookup tool when you encounter an unfamiliar code, and check our detailed guides for deeper dives into specific additive categories. Knowledge, not fear, is the goal.

Written by the AdditiveChecker Editorial Team. Last reviewed May 2026.