'May contain traces of nuts and peanuts' is a phrase burnt into the heads of anyone with a nut allergy. It might be hidden in small italic print, under a packaging seam, sometimes not even in bold; but we become masters at finding it. The blanket response is: "if it’s on a product, avoid it". This isn’t wrong, but there might be more nuance than most people expect: because we associate this warning with an immediate 'no', the decision becomes automatic. Treating every single 'may contain' warning equally, regardless of which nut, which manufacturer, or production line, could sometimes mean living with added restriction that isn’t necessary, or missing signals that actually matter to a specific allergy. 'May contain' isn’t a standardised safety measure, it’s a voluntary disclosure, and what sits behind this small phrase may vary massively from one product to the next.
Nuts and peanuts are legally distinct
This is one of the most practically important things to understand about allergy labelling, and one of the least discussed. Peanuts are legumes, botanically closer to lentils than to almonds, and UK food law requires them to be listed separately. A 'may contain nuts' label should, under current FSA guidance, refer only to tree nuts. In practice, older products and some smaller manufacturers haven't always followed this precisely, which is why checking the full ingredient list rather than relying on the summary warning remains essential. But if a product specifies 'may contain peanuts', that's a specific and serious signal for peanut allergy sufferers.
Where pine nuts fit in
Pine nuts are treated differently under UK and EU labelling compared to the US, where the FDA considers them a tree nut. Pine nuts are botanically distinct from tree nuts however, and are technically seeds. More important than this is their cross reactivity with other nuts. While tree nuts have many established and predictable cross-reactivity pairings, such as cashew allergies often come with pistachio allergies, most people with pine nut allergies do not react to other nuts. There are some exceptions, such as peanut cross-reactivity being found in some studies, but generally there isn’t the same level of nut allergy association.
'May contain' type phrases are voluntary
Precautionary allergen labelling (known as PAL) should only be used when there is a legitimate risk of cross-contamination that cannot be controlled or managed and not as a blanket disclaimer for every product. PAL is typically seen on pre-packaged foods, and can also be phrases like 'made in a factory that handles peanuts', or 'not suitable for nut allergy sufferers'. People are often surprised to learn that these warnings are voluntary. No manufacturer is legally required to add them, they exist as a precaution for when a real risk of unwanted cross-contamination is identified. In theory this means a 'may contain' warning signals a real, assessed risk. In practice, some manufacturers add them defensively as blanket statements, to cover liability rather than because the risk has been specifically identified. Others with genuinely controlled production lines, where rigorous allergen protocols are in place, may produce products that are safer in practice than products without a warning. The label tells you a risk was identified, but can’t tell you whether this is genuine or a lazy way for a manufacturer to cover themselves just in case. This is frustrating for allergy families looking for safe, routine, nut free options.
Manufacturing and what labels might not capture
Lindt chocolate is a useful example here to show that it is not always straightforward across different nut allergies, and that risk appetite is a big part of deciding to consume a product or not. While Lindt UK states that "no Lindt product is 100% guaranteed nut allergen safe", they also say that within their "may contain nuts" warning the 'nuts' do not include 'peanuts'. They specify their cross-contamination risk across "traces of almond, hazelnut, pistachio, macadamia, cashew or pecan" [1]. So with the right risk appetite, people who are only allergic to peanuts or other specific nuts may be willing to enjoy Lindt products. What a 'may contain' warning cannot tell you is how serious the cross-contamination risk actually is, how frequently the allergen appears in that production environment, whether shared equipment is cleaned between runs, or whether the risk is theoretical or genuinely documented. Two products with identical labels can represent meaningfully different levels of risk depending on the manufacturer's processes, and you can't always tell from the packaging alone.
Label changes and product recalls
People with severe nut allergies often become creatures of habit with their diets, knowing which brands and products are safe for them to buy each week. 'May contain' labels appearing suddenly one week can be incredibly frustrating for this reason. Products that have been eaten safely for three years can become genuinely unsafe after a manufacturing change, and sometimes the new label may reach shelves before anyone thinks to tell their customers. Product recalls for undeclared allergens happen regularly in the UK, most often because a supplier change introduced a new cross-contamination risk that wasn't initially identified. The Food Standards Agency (FSA) publishes allergen alerts when this happens, though by definition they arrive after the product is already in circulation. Checking the label every time, even for products you know well, is the only consistent protection against this. A label you read six months ago is not the label on the product today.
How to manage 'may contain' warnings
None of this means that 'may contain' warnings should be ignored. For anyone with a severe allergy or history of anaphylaxis, the conservative approach remains the safest. However, understanding the nuance behind these labels allows us to ask better questions. Is this warning specific e.g. 'may contain peanuts', or generic 'may contain nuts'? Does the manufacturer publish their allergen controls? Is this a product from a trusted brand known for rigorous allergen protocols, or a manufacturer whose processes you know nothing about? The may contain label is the start of assessing a product. For many people managing allergies day to day, this can be the difference between a diet that's unnecessarily restricted and one that's safe. The more clearly you can read what a label is actually telling you, rather than assuming what it means, the more confidently you can make decisions about what's safe.
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