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What it is. The potassium salt of sorbic acid, which stops mould and yeast growth.

Why it is used. Used in cheese, baked goods, dried fruit, wine and dressings.

What the evidence says. Widely used and long regarded as one of the gentler preservatives. EFSA's 2015 re-evaluation lowered the acceptable daily intake and noted gaps in the genotoxicity data, asking for more work, while finding no evidence of harm at the levels actually used.

Permitted with maximum levels. EFSA has asked for further data rather than restricted it.

Assessed against EFSA. Full entry for E202

What it is. A preservative that stops yeasts, moulds and some bacteria growing in acidic foods.

Why it is used. Used in soft drinks, sauces, pickles and dressings.

What the evidence says. EFSA re-evaluated it in 2016 and kept an acceptable daily intake, with normal exposure below it. The known issue is specific: in acidic drinks that also contain vitamin C, benzoate can form small amounts of benzene, so manufacturers reformulated to avoid the combination. It was also present in the drink mixes used in the Southampton hyperactivity study, though the warning requirement that followed applies to the colours rather than to benzoate.

Permitted with maximum levels in the foods where it is allowed.

Assessed against EFSA, UK FSA. Full entry for E211

What it is. A modified plant fibre used to thicken and stabilise.

Why it is used. Common in ice cream, low fat products, gluten free bakery and sauces.

What the evidence says. Falls in the same emulsifier and gut research bucket as polysorbate 80, with early human work hinting at effects on the microbiome. Interesting, not conclusive.

Permitted with limits.

Assessed against EFSA. Full entry for E466

What it is. A calorie free intense sweetener, often blended with other sweeteners to round out taste.

Why it is used. Used in diet drinks, dairy and confectionery.

What the evidence says. Long treated as safe by regulators. Some recent research on sweeteners and the gut microbiome is ongoing, but nothing has changed the official safety position.

Permitted with an acceptable daily intake in all three regions.

Assessed against EFSA, JECFA. Full entry for E950

What it is. An intense sweetener made from sugar, around 600 times sweeter, so it is used in very small amounts.

Why it is used. Sweetens diet drinks, tabletop sweeteners, dairy and baked goods.

What the evidence says. Regulators have treated it as safe for decades and the acceptable daily intake has not changed. Newer laboratory work on a breakdown product, and the general question of sweeteners and the gut microbiome, keep it under discussion, but that work is early and has not moved any official position.

Permitted with an acceptable daily intake in all three regions.

Assessed against EFSA, JECFA. Full entry for E955

What it is. Vitamin C, added to protect colour and flavour and sometimes to fortify.

Why it is used. Stops browning in juices and cut fruit, protects fats, and boosts vitamin content.

What the evidence says. Beneficial and harmless at the levels used. Included here as a reminder that an E number is just a code, and plenty of them are ordinary nutrients.

Permitted freely, no concern.

Assessed against EFSA, JECFA. Full entry for E300