Antioxidants as Food Additives: E300-E399 Explained
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Antioxidants as Food Additives: E300-E399 Explained
Antioxidants in food prevent oxidation — the process that causes fats to go rancid and food to lose colour and flavour. In the E-number system, they carry numbers E300 through E399. Interestingly, many of these additives are identical to vitamins: E300 is ascorbic acid (Vitamin C), E307 is tocopherol (Vitamin E). For restaurant operators, the labeling „with antioxidant“ is mandatory on the menu when products contain these substances as additives. For an overview of all additives, see our food additives overview page.What Are Antioxidants in Food?
Antioxidants are substances that slow or prevent the oxidation of fats, oils, and other food components. Without them, fats would go rancid, meat products would lose their colour, and processed products would spoil far sooner. They are functional additives in the purest sense — no nutritional value, purely technical purpose.
It is important to distinguish antioxidants as food additives from antioxidants marketed as dietary supplements. The underlying substance can be chemically identical, but the legal and labeling context differs entirely. In a supplement, ascorbic acid is marketed for its role in scavenging free radicals. In a sausage, the same compound is there to keep the meat looking red.
In EU food law, antioxidants are grouped under E300-E399. There are two broad categories: natural antioxidants — primarily vitamins such as ascorbic acid and tocopherol — and synthetic antioxidants, notably BHA and BHT. Full list: E-numbers list.Key Antioxidants at a Glance
The range runs from ubiquitous, well-tolerated substances to more controversial synthetic compounds:
- E300 Ascorbic acid (Vitamin C): Natural, broadly approved, widely used in meat products, juices, and baked goods for colour preservation and oxidation control.
- E301 Sodium ascorbate: Sodium salt of ascorbic acid with identical effect, common in processed meat products.
- E306-E309 Tocopherols (Vitamin E): Naturally present in vegetable oils, protects fats from rancidity — standard in quality cooking oil production.
- E310-E312 Gallates: Used in fats and oils; EU maximum limits apply and must be strictly observed.
- E315-E316 Erythorbic acid/Sodium isoascorbate: A more cost-effective alternative to E300, common in processed meat.
- E320 BHA (Butylated hydroxyanisole): Synthetic, subject to ongoing scientific debate, approved for use in fats and chewing gum.
- E321 BHT (Butylated hydroxytoluene): Synthetic, similar mechanism and similar concerns to BHA.
- E322 Lecithin: Derived from soybeans or sunflower seeds, functions as both antioxidant and emulsifier — note that soy lecithin is also a declarable allergen.
- E330 Citric acid: Naturally found in citrus fruits, one of the most widely used food additives across all product categories.
Vitamin C and Vitamin E as Additives
E300 ascorbic acid and Vitamin C are chemically the same — yet legally, there is a meaningful distinction between adding a substance as a nutrient supplement and adding it as a technical antioxidant. When it is added as an additive, menu labeling becomes mandatory. Naturally occurring amounts already present in the raw ingredients do not trigger this requirement.
The same logic applies to E307 tocopherol (Vitamin E). In vegetable oils, tocopherol prevents oxidation and protects flavour. If it is added as a deliberate additive — for instance, to extend the shelf life of a prepared product — the declaration obligation applies immediately. In practice, this means a product can display „Vitamin C“ on its packaging and still require the footnote „with antioxidant“ on your menu if the vitamin was added for technical purposes.
In practice, ascorbic acid and tocopherol appear most frequently in meat products, ready-made dressings, and industrially processed base ingredients. See also Preservatives for related protective additives that carry their own declaration requirements.Controversial Antioxidants: BHA and BHT
BHA (E320) and BHT (E321) are synthetic antioxidants that have been subject to scientific scrutiny for years. The primary concern is potential endocrine disruption — hormonal effects observed in animal studies. Several countries, including Japan, have substantially restricted BHA use.
The European Food Safety Authority (EFSA) has reviewed both substances and continues to authorize them, but sets maximum limits well below the levels associated with observed effects in research. A clear trend is nonetheless visible: major food manufacturers are increasingly replacing BHA and BHT with natural alternatives such as tocopherol or rosemary extract, partly for regulatory reasons and partly in response to consumer preference.
For most restaurant operators, direct exposure to BHA or BHT is limited — neither is typically purchased as a standalone ingredient. However, both may be present in industrial precursor products such as ready-to-fry batters, certain margarines, or pre-mixed seasoning blends. Checking supplier ingredient lists is the only reliable way to know.
Labeling Requirements for Antioxidants
The core rule is straightforward: if a dish on your menu contains a product to which antioxidants have been added as additives, the menu must include the note „with antioxidant“ — either as a footnote or inline with the dish description. This applies even when the additive in question is a natural vitamin.
Soy lecithin (E322) requires particular attention. It functions as both an antioxidant and an emulsifier, and it is simultaneously a declarable allergen (soy). This means a single ingredient triggers two distinct labeling obligations: you must declare it as an additive category and as an allergen. Overlooking the allergen declaration is one of the most frequent inspection findings — and a common cause of fines.
Practical tip: work through the full ingredient list of every supplier product and flag all E-numbers in the E300-E399 range. Many finished products contain ascorbic acid or citric acid without these being immediately obvious from the product name. Detailed guidance: Additive labeling.Label Antioxidants Reliably
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FAQ: Antioxidants in Food
What do antioxidants do in food?
Antioxidants in food prevent or slow oxidation — a chemical process in which oxygen reacts with fats, oils, and other components. Without antioxidants, fats would go rancid, meat products would lose their colour, and flavour would deteriorate. Shelf life would decrease significantly. Typical applications include meat products (ascorbic acid maintains the red colour), vegetable oils (tocopherol prevents rancidity), and fruit products (citric acid slows browning). It is important to understand that antioxidants as additives serve a technical function and are not primarily intended for health benefits. The same compounds that appear in supplements are being used here purely as processing aids.
Are antioxidant additives healthy?
The answer requires nuance. Some antioxidant additives are identical to vitamins — E300 is Vitamin C, E307 is Vitamin E. In the quantities added to food, however, they primarily serve a technical function and contribute minimally to your overall nutrient intake. Natural antioxidants like ascorbic acid and tocopherol are considered safe and are accepted by regulatory authorities worldwide. Synthetic antioxidants like BHA (E320) and BHT (E321) are more controversial — there are ongoing discussions about possible endocrine effects. EFSA has established maximum limits for all approved antioxidants that are considered safe based on current scientific knowledge.
Which E-numbers are antioxidants?
Antioxidants carry EU E-numbers from E300 to E399, though not all numbers in that range are assigned. The best known are E300 ascorbic acid (Vitamin C), E306-E309 tocopherols (Vitamin E), E320 BHA, E321 BHT, E322 lecithin, and E330 citric acid. Some of these substances serve dual functions: E322 lecithin also acts as an emulsifier, E330 citric acid also serves as an acidity regulator. In day-to-day restaurant practice, operators most frequently encounter E300 (in meat products and juices), E322 (in baked goods and chocolate), and E330 (in nearly all product categories — from sauces to dressings to ready-made bases).