How E numbers work: what the first digit tells you

The three-digit number after the letter E is not random: it carries information about why the substance was added. You only need to memorize six ranges, and after that, reading an ingredient list becomes much faster—the code immediately shows whether the additive is for coloring, preservation, or maintaining structure. What the number does not tell you is anything about safety.

What the letter itself means

E stands for Europe. The code is assigned to a substance that has undergone evaluation and has been added to the list of approved additives. In other words, the presence of a code means the additive has been reviewed and authorized, not the other way around.

This is the first thing to keep in mind: a code is a sign of regulation, not of something foreign. Under these codes, you will find baking soda, citric acid, ascorbic acid, lecithin, pectin, and other substances that do not alarm anyone when written out as words.

Six ranges

Beyond these, the ranges become less common: E900s are glazing agents, antifoaming agents, and sweeteners; E1000s are enzymes, modified starches, and others.

There is a separate breakdown for each group: colors, preservatives, antioxidants, emulsifiers, stabilizers and thickeners, acidity regulators.

Boundaries are conditional

A single substance often performs multiple functions, and the number reflects its primary, not its only, function. Ascorbic acid (E300) is listed under antioxidants, but it also acts as an acidity regulator. Citric acid (E330) acidifies and binds metals. Phosphates retain water and regulate acidity simultaneously—see our article on phosphates for more.

That is why the function is usually written next to the code in the ingredient list: "preservative E202," "stabilizer E450." The function indicates why the additive is there, and the code indicates exactly what it is.

What the number does not tell you

Safety. Within a single range, there are substances with different safety assessments. Adjacent numbers do not inherit properties from one another.

Origin. E160a represents carotenes, which can be derived from carrots or synthesized; E322 is lecithin from sunflower or soy. The code is the same.

Quantity. Limits are set separately, based on products and maximum levels, and are not reflected in the code.

Current status. Authorization can be revoked—as happened with titanium dioxide E171—while the code remains the same.

How to use this

1. Read the first digit to understand the purpose. This saves time: in a second, it is clear whether the additive is for coloring or maintaining structure.
2. Do not look for a "list of harmful additives." Such lists have been circulating online for years and usually do not match any current official list.
3. Look at the length of the ingredient list, not just an individual number—a sign discussed in our article on E numbers in ingredients.
4. Check a specific code in a reference guide. An assessment of each, with notes on its status in the Russian Federation and the EU, can be found in the E-additive reference guide.

Count it from a photo

Frequently asked questions

What does the first digit in an E number mean?

The function of the additive: 100s are colors, 200s are preservatives, 300s are antioxidants and acidity regulators, 400s are stabilizers, thickeners, and emulsifiers, 500s are leavening agents and anti-caking agents, 600s are flavor enhancers.

Does the presence of an E code mean the substance is artificial?

No. A code is assigned to a substance that has undergone evaluation and been added to the list of approved additives. The codes include baking soda, citric acid, ascorbic acid, lecithin, and pectin—all of which are quite common substances.

Can you tell if an additive is dangerous by its number?

No. Within a single range, there are substances with different evaluations, and consecutive numbers do not inherit any properties from one another. The number indicates the function, not the safety.

Why is one substance classified into different groups?

Because many additives perform multiple functions, and the number reflects the primary one. Ascorbic acid acts as both an antioxidant and an acidity regulator; phosphates retain water and regulate acidity simultaneously.

Should you use lists of "harmful additives" found on the internet?

Such lists have been circulating online for years and usually do not match any current official list. It is more reliable to check a specific code in a reference guide that lists its current status.

Read next

• E-numbers in ingredients: how the code is structured and what it means — An ingredient list contains E330, and it is impossible to tell from this code whether it is citric acid or something better to avoid.
• Food dyes: which ones are restricted and why — The color of food carries information: it is used to judge ripeness, freshness, and taste even before the first bite.
• Preservatives: why they are needed and what questions arise about them — The word "preservative" on an ingredient label is often seen as a negative, and products "without preservatives" sell better.

This article is for general information. It is not medical advice, a diagnosis, or a prescription for treatment or a diet, and it does not replace a consultation with your doctor. If you have a health condition, are pregnant, take medication, or follow a diet prescribed to you, decisions about food belong with your doctor.

Figures from regulations, guidelines and studies are given as they stood when this article was prepared and may since have changed; check them against the primary sources. This article is not advertising, an offer, or individual advice, and neither the author nor the site owner is responsible for decisions taken on the basis of it.