Hidden Names for Peanut on UK Food Labels
Peanut hides under names like groundnut, arachis oil and monkey nut. Here are the aliases to look for, plus how UK labelling makes peanut easier to spot.
Peanut is one of the most familiar food allergens, yet it does not always appear on a label as the plain word “peanut”. It can hide behind older names, oil names and a few terms that look harmless if you do not know them. This guide walks through the aliases to watch for and explains how UK labelling rules are designed to help you.
The peanut aliases to know
Peanut is a legume, not a true nut, which is partly why it travels under several different names. The most common ones to look for are:
- Groundnut and groundnut oil. This is simply another word for peanut. Groundnut oil is peanut oil.
- Arachis and arachis oil. Arachis is the botanical name for the peanut plant. Arachis oil is peanut oil, and it sometimes turns up in cosmetics and skin products as well as food.
- Monkey nut. An older everyday name for peanuts in their shells.
- Mandelonas and nu-nuts. These are peanuts that have been flavoured and reshaped to resemble or substitute for almonds or other nuts. They are still peanut.
- Beer nuts and mixed nuts. Not aliases as such, but a reminder that peanut is often blended in with tree nuts under a general heading.
If you see any of these, treat the product as containing peanut.
Where peanut tends to hide
Peanut shows up in places you might not expect. Many sauces lean on it for body and flavour, including satay, some curry pastes and certain dressings. Baked goods, cereal bars, chocolate, ice cream and biscuits are common sources too. Peanut flour is sometimes used as a protein or texture ingredient in processed foods.
Cuisines that traditionally use peanut heavily, such as some South East Asian and West African dishes, are worth extra care when eating out or buying ready meals. The peanut may be cooked into a base rather than visible on top.
How UK labelling helps you
UK law requires the 14 main allergens to be declared whenever they are used as an ingredient in prepacked food. Peanut is one of those 14. On the ingredients list, it must be emphasised so it stands out from the rest of the text, usually by being printed in bold. This means you can often scan an ingredients list quickly and let the bold lettering catch your eye.
It is worth knowing the difference between the ingredients list and a “may contain” statement. The bold allergen in the ingredients list tells you peanut is deliberately in the recipe. A “may contain peanuts” line is voluntary precautionary labelling, added by a manufacturer to flag a possible risk of accidental traces from shared equipment or a shared site. It is not part of the recipe, but for many people with peanut allergy it is still important information.
For food that is prepacked for direct sale, such as a sandwich made and wrapped on the premises, Natasha’s Law requires a full ingredients list with the allergens emphasised, just like other prepacked food. That closed a gap that used to make these items harder to check.
A quick word on caution
Reading a label is a skill, and the aliases above are the part most people miss. Once you know that groundnut, arachis and monkey nut all mean peanut, a large share of the confusion disappears. The rest is simply slowing down enough to read every ingredient, every time, because recipes change without warning.
Take a moment with every label, even on a product you have bought many times before. If you want help decoding an ingredients list or spotting a hidden allergen name, use The Food Allergy Lab to check before you buy.
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Common questions
Is groundnut the same as peanut?
Yes. Groundnut is simply another name for peanut. Despite the name, the peanut is not a tree nut, it is a legume that grows underground, which is why it is sometimes called groundnut. If you see groundnut listed, treat it exactly as you would peanut.
Does peanut have to be highlighted on UK ingredients lists?
Yes. Under UK law, peanut is one of the 14 allergens that must be emphasised in the ingredients list, usually in bold, so it stands out from the surrounding text. This applies to prepacked food sold in the UK.
Is refined peanut oil safe for people with a peanut allergy?
This is something to discuss with your allergy team rather than decide from a label. Highly refined peanut oil is treated differently from cold-pressed or unrefined oil, but the labelling and your own clinical advice should guide you. Never assume. Always read the label and check with your healthcare professional.