Packaged snacks, industrial sauces and ready meals contain additives you would never see in a home recipe. They are not all dangerous. Most are authorized in the EU after scientific assessment. But “authorized” does not mean that every question about every additive is closed: some have very solid safety profiles, some are under reassessment, and some have specific issues worth understanding. This article looks at the most common ones and at what the scientific and regulatory system actually says about them.

There is a category of ingredients you almost never find in a normal recipe. Not because they are rare or expensive — quite the opposite. They are cheap, stable and effective. You see them mostly on packaged-food labels, written as an E-number or as a technical name that means little to anyone outside the industry.

They are not automatically poisons. Most are permitted in the European Union after evaluation by EFSA, the European Food Safety Authority. But permission is not the same as saying every additive is nutritionally irrelevant, and the real picture is more nuanced than either side of the argument usually admits — both the people who defend all additives without reservation and the people who demonize every E-number alike.

It is worth understanding the additives you see most often, what they do and where scientific questions remain open.

The regulatory framework: EU Regulation 1333/2008

Regulation 1333/2008 sets the framework for food additives in the European Union. In broad terms, authorization requires a scientific safety assessment, a legitimate technological need and use that does not mislead the consumer. The rules also follow the principle that additives should be used at no more than the level necessary to achieve the intended technological effect.

On paper, that is a robust system. In practice, the boundary between a technologically necessary additive and one used mainly for commercial convenience can be less clear. Extending shelf life may have an obvious technological justification. Making a snack brighter orange is harder to defend as necessary, even if the color is legally permitted.

Packaged snacks: what is inside

Some artificial colors deserve specific attention. E102 and E110 belong to the group popularly known as the “Southampton Six,” six colors studied in a randomized controlled trial published in The Lancet in 2007 in relation to activity and attention in children. The European regulatory response ultimately required certain products containing these colors to carry a warning that they “may have an adverse effect on activity and attention in children.” It is an example of how an additive can remain permitted while still carrying a specific warning.

Industrial sauces: ketchup, mayonnaise and ready-made condiments

Sodium benzoate, E211, deserves a separate note. Under certain conditions, particularly in acidic products containing ascorbic acid or vitamin C, benzene can form. Heat and light can accelerate the reaction.

In practice, this combination occurs in acidic products that contain both additives. Common examples include energy and sports drinks with added vitamin C, fruit-flavored soft drinks using E211 as a preservative and ascorbic acid as an antioxidant, bottled fruit juices fortified with vitamin C, and some acidic condiments and sauces. Diet drinks may be more prone to benzene formation than sugar-sweetened ones because sugar can partly reduce its formation.

The practical check is simple: when a drink, sauce or juice lists both E211 or “sodium benzoate” and E300 or “ascorbic acid” or “vitamin C” in the same ingredient list, you are looking at a combination that can produce benzene under acidic conditions and heat. Levels found in most products remain below the WHO guideline of 5 parts per billion, but some fruit-flavored diet drinks exceeded it in FDA testing in 2005. This is not an alarm about occasional consumption. It is useful information for people who consume these products regularly, especially children.

Monosodium glutamate, E621, is used mainly as a flavor enhancer. It is not a preservative and it does not provide structure; its purpose is to increase savory intensity and palatability. It is legal and widespread in many industrial sauces and savory products.

Carrageenan, E407, is one of the more debated additives in this group. Derived from red seaweed, it is used as a stabilizer in sauces, dairy products and ready meals. EFSA has kept it authorized while also identifying areas in which the evidence base has required further clarification. Cell and animal studies have raised questions about intestinal and inflammatory effects, while human evidence is more limited. It is not an additive that automatically makes a food unsafe, but it is an example of an authorized ingredient for which scientific evaluation continues.

Ready meals: phosphates and nitrites

Phosphates such as E450, E451 and E452 are used for technological functions including water retention in processed meats. The concern is cumulative exposure: phosphorus is naturally present in many foods, and additive-derived phosphate increases total intake. EFSA's reassessment considered this broader exposure and established safety parameters accordingly.

Sodium nitrite, E250, is the better-known case. It is important in processed meat because it helps control dangerous microorganisms, including those associated with botulism. At the same time, nitrite can contribute under certain conditions to the formation of N-nitroso compounds, some of which are carcinogenic. That is the real trade-off: removing nitrites entirely can increase microbiological risk, while frequent consumption of processed meat is associated with higher long-term health risk. Public-health advice therefore focuses on limiting habitual intake of processed meats rather than pretending the preservative can simply be removed without consequences.

The E171 case: when reassessment changes the rules

Titanium dioxide, E171, was used as a white color in icings, confectionery and baked goods. In 2021 EFSA concluded that it could no longer be considered safe as a food additive because genotoxicity concerns could not be ruled out. The EU subsequently banned its use in food.

That case matters because it shows something important about the regulatory system: authorization is not supposed to be permanent by default. Additives can be reassessed and removed when new evidence changes the risk assessment. The system is not perfect, but it is not static either.

Which codes deserve a second look?

At the end of this article you will find a table with all the additives described above, organized by priority for attention, the products in which they appear most often and the specific reason each is worth noticing. It is designed to be printed or saved as a PDF — a quick reference for when you are standing in front of the shelf and do not remember the details.

The useful approach is not to treat every E-number as a verdict. They are pieces of information. Some additives have long-standing, reassuring safety profiles. Others have specific warnings, exposure limits or unresolved research questions. The skill is not to fear all of them or ignore all of them, but to know which ones deserve a closer look and why.