Macadamia allergy

By Symon, Every Label · June 30, 2026

Macadamia allergy is an IgE-mediated immune reaction to the proteins in macadamia, Macadamia integrifolia, and it is one of the less common and, on average, milder tree-nut allergies, though that average never describes any one child. In plain terms: your child’s immune system can read certain macadamia proteins as a threat, and a true reaction can run from an itchy mouth to a whole-body allergic reaction that affects breathing and blood pressure, called anaphylaxis. Macadamia is botanically a world apart from the other tree nuts, in its own plant family (Proteaceae), and it is a named major tree-nut allergen for labeling. Tree-nut allergy as a group runs about 1 to 2 percent in US children, and macadamia is among the least frequently reported individual tree nuts within that group (Gupta 2019); a clean macadamia-specific number is not separately established, so this page does not invent one.

If your child was just diagnosed, read this first.

This page is long on purpose. It is also the page you will come back to for years. You do not need all of it today. This week, this is what matters:

• Carry epinephrine everywhere your child goes if your allergist has prescribed it, and learn the few signs that mean use it now. That is the section to read tonight (Emergency preparedness, below). If you do not have the prescription yet, that is the first call to your allergist or pediatrician.
• Read every label, every time. The words to catch are macadamia, Macadamia integrifolia, Queensland nut, and bush nut (Reading labels, below).
• Macadamia is often milder on average than walnut or cashew, and the allergy is frequently isolated to macadamia alone. That is encouraging, but it is not a guarantee: macadamia can still cause anaphylaxis, so a confirmed allergy still means avoidance and a plan (What macadamia allergy is, below).
• The other tree nuts are a separate question, not an automatic yes and not an automatic no. They are tested, not assumed (Cross-reactivity, below).
• You do not have to understand the protein science to keep your child safe. The components are for unhurried conversations with your allergist, and for macadamia there is honestly less of that machinery than for most nuts.
• The hidden one to know: macadamia is a premium ingredient, so it turns up in white-chocolate-macadamia cookies and gourmet confections a parent does not expect (Hidden sources, below).

Everything else here is waiting for you, in roughly the order the questions tend to come up. Read it when you want it.

Where a fact below is clinical, it carries its source. None of it is a substitute for your allergist.

What macadamia allergy is, and who has it

Macadamia allergy is an IgE-mediated immediate-type food allergy, and in that form it is anaphylaxis-capable, which is the reason for the auto-injector, the label habit, and the written plan. When your child eats macadamia, IgE antibodies on their immune cells latch onto the macadamia proteins and trigger a release of histamine and other chemicals within minutes. That release is the reaction.

Macadamia is a true tree nut for labeling but botanically it is in a family all its own, Proteaceae, and it is not related to the walnut and pecan family, the cashew and pistachio family, the hazelnut family, the brazil-nut family, or the almond family. That isolation matters, and the cross-reactivity section is where it pays off: a macadamia allergy pulls fewer other foods along with it than a cashew or walnut allergy does, and macadamia allergy is frequently an isolated allergy rather than part of broad tree-nut reactivity.

There is one balancing thing to be honest about up front. On average, macadamia is of lower allergenic potency and causes severe reactions less often than the storage-protein-heavy nuts like walnut and cashew. That is genuinely encouraging, and it is also a statement about a population, not a promise about your child. Documented anaphylaxis to macadamia does happen, so a confirmed macadamia allergy is treated epinephrine-first while the picture is sorted out, and the milder average is never a reason to skip the auto-injector.

A clean, challenge-confirmed macadamia-specific prevalence figure is not separately established. Tree-nut allergy as a class runs roughly 1 to 2 percent in US children (Gupta 2019, a parent-report survey), and macadamia is among the least frequently named individual tree nuts within that group, so a precise macadamia percentage is not asserted here because none is grounded. Onset is usually in early-to-mid childhood, often at an early known ingestion of nuts.

Diagnosis combines your child’s history with testing, and for macadamia the testing story is unusual, because it leans harder on history and a supervised challenge than on the blood-test components that carry the weight for most nuts. The next section is why.

The components that drive severity

Macadamia is unusual among the tree nuts for what it does NOT have: a well-characterized panel of proteins your allergist can test one by one. For peanut, cashew, hazelnut, and almond there is a single high-value component to ask for by name, and it changes how serious the picture looks. For macadamia there is not one yet, and being honest about that is more useful than pretending otherwise.

A standard macadamia test (the skin prick, sometimes done as a prick-to-prick with the fresh nut where the commercial extract is weak, or the basic blood test to whole macadamia) only tells you the immune system has noticed macadamia at all. Like the other nuts, a positive result is common in a child who is sensitized but actually tolerant, especially a child already sensitized to several tree nuts. Component testing, which for other nuts breaks the result down protein by protein, cannot currently do that for macadamia: macadamia is what allergists call component-light. Only one macadamia protein is characterized at all (a storage protein, a vicilin-like 7S globulin), it does not yet have a formal international name, and there is no routine clinical blood test for it.

So the high-value move for macadamia is different from the move for cashew or peanut. There is no single component number to ask for, and there is no validated cutoff to decode. Instead the diagnostic weight falls on your child’s history and, where the picture is unclear, a supervised oral food challenge, which for macadamia is often the step that actually settles whether your child is allergic, particularly if your child is sensitized to several nuts and you need the macadamia question answered specifically. You do not need to learn the protein science. The little that exists is below.

Cross-reactivity, real and reassuring

Macadamia is the most taxonomically isolated of the common tree nuts, and that shapes this whole section: a macadamia allergy pulls fewer other foods along with it than people fear, and there is no cleared “if your child reacts to macadamia they will also react to nut X” rule on our verified floor. What macadamia cross-reactivity comes down to is honest about what is known and what is not, rather than a list.

Macadamia sits in its own botanical family, and the allergy is frequently isolated. Macadamia is in the Proteaceae family, on its own, unrelated to walnut and pecan, to cashew and pistachio, to hazelnut, to brazil nut, or to almond. One real consequence is that macadamia allergy is frequently an isolated allergy: many children allergic to macadamia are not reacting to a web of other nuts. This is encouraging, and it is also why this section is short. It is not a green light, though, because being unrelated to the other nuts does not by itself tell you whether your particular child is or is not allergic to them. That is the next paragraph.

The other tree nuts are a separate question: tested, not assumed. Whether a macadamia-allergic child can eat walnut, cashew, hazelnut, pecan, pistachio, almond, or brazil nut is a real and common question, and the honest answer is that it is decided one nut at a time by your allergist, not pulled along automatically by the macadamia result and not ruled out by it either. There is no cleared blanket rule in either direction, and this page will not tell you your child can eat the other nuts or that they cannot. Your allergist tests and decides. If your child reacts to macadamia through the storage protein, a positive test to another nut’s storage protein deserves to be taken seriously rather than waved off, because tree-nut storage proteins are a red flag for whole-body reactions, not a reassuring result.

The one clear reassurance: coconut. Coconut, despite the name and the FDA’s historical labeling rule, is botanically a fruit (a drupe), not a true tree nut, and most tree-nut-allergic people tolerate it. Coconut is usually a yes, confirmed with your allergist before you introduce it rather than assumed.

That is the honest whole of it for macadamia. The cross-reactivity story is thin not because the page is holding something back, but because macadamia genuinely sits apart, and the data on it is sparse. The questions that feel like cross-reactivity for macadamia are really the “which other nuts” question (tested by your allergist) and the hidden-source question (where macadamia turns up unexpectedly, which is the next section).

Hidden sources

Macadamia is a premium ingredient, and that is the whole of its hidden-source story: it turns up in expensive, indulgent foods a parent may not think to check, more than in everyday processed staples. These are worth a one-time read now; after that you will spot them on your own.

Premium cookies and confections. The white-chocolate-macadamia cookie is the canonical hidden macadamia exposure, and macadamia turns up the same way in gourmet chocolates, premium confections, and high-end baked goods. Because macadamia is a premium add-in, a product whose label says only “contains nuts” or “tree nuts” may carry it without naming it prominently, so a fancy cookie or chocolate is exactly the place to read the full ingredient line.

Nut mixes and trail mixes. Macadamia is common in premium and gourmet mixed-nut assortments and trail mixes, so a mixed-nut product is a likely macadamia source even when macadamia is not the headline nut.

Macadamia oil, where the refinement state decides. Macadamia oil shows up in salad dressings and in skincare and hair products. Whether it carries a risk depends on how it is processed: a highly refined, deodorized oil is largely stripped of protein and most allergic people tolerate it, while a cold-pressed, gourmet, or unrefined macadamia oil keeps its protein and is not assumed safe. The refinement state is the deciding fact, so an unrefined or gourmet oil is worth treating with the same caution as the nut, and the safe-versus-not question is one for your allergist, not a blanket clearance.

A note on cooking. Roasted, dry-roasted, and baked macadamia are no safer than raw, because the macadamia storage protein survives heat and digestion. Cooking is not a way to make macadamia safe.

How exposure actually happens

The routes parents fear most are usually not the ones that cause serious reactions. Eating macadamia is. The rest are lower-risk than they feel.

Eating it (high). Swallowing macadamia protein is the route that causes whole-body reactions, and it is effectively the only significant route for macadamia. Everything else is far behind it. Cooking does not help: the macadamia storage protein is heat-stable, so roasted, dry-roasted, and baked macadamia stay allergenic for a child who reacts to it.

Skin contact (low). Macadamia on intact skin usually causes at most a local reaction in a sensitized child, and skin contact is not a documented route by which a child becomes allergic in the first place. As with other food allergens the risk is somewhat higher on broken or eczematous skin, but macadamia is not a high skin-contact-risk allergen.

Breathing it in (low). Macadamia is not volatile, and unlike shellfish it has no cooking-aerosol picture, so ambient smell and cooking vapor are low-risk for the typical child.

There is no separate medical-care category to flag for macadamia. Macadamia is not an ingredient in routine vaccines, anaesthetic agents, or other medical products at the quality floor this page renders from, so there is no vaccine or anaesthesia step specific to macadamia. As always, tell every provider about your child’s allergies; there is simply no macadamia-specific medical-care warning to render.

Reading labels

This is the habit that does the most day-to-day work, and it gets fast. The words to scan for are macadamia, Macadamia integrifolia, Macadamia tetraphylla, Queensland nut, and bush nut. In the US, macadamia is one of the tree nuts that must be named specifically under FALCPA; the EU and UK require tree-nut declaration, with macadamia named in the Annex II tree-nut entry, under Regulation 1169/2011; and in Australia and New Zealand, where macadamia is a native crop, tree nuts are declared allergens under the FSANZ Food Standards Code (FALCPA; EU 1169; FSANZ).

A few terms are signals to slow down: premium nut blend and gourmet nut (premium assortments frequently include macadamia without naming it prominently), gourmet confection or premium chocolate (the white-chocolate-macadamia cookie is the canonical surprise), and natural flavoring where a manufacturer is not transparent. When a term is unclear and the manufacturer will not say, treat it as a reason to call the company, not a reason to assume it is safe.

Then there are the precautionary labels: “may contain tree nuts,” “made in a facility that processes tree nuts.” These are voluntary and unregulated in both the US and the EU, so they are not a reliable measure of how much risk is actually present. How strictly you treat them is a personal call along a spectrum, weighing a real but variable cross-contact risk against ruling out a large share of the grocery store. This page will not pick that threshold for you.

Severity, and what predicts a bad reaction

The strongest available predictor of a severe macadamia reaction is your child’s clinical history, in particular whether they have had a previous systemic reaction. This is different from most nuts on purpose: macadamia has no component blood test and no severity-bearing threshold to lean on, so the history carries the weight that a component number carries for peanut or cashew, and no test result reclassifies macadamia risk the way Ara h 2 or Ana o 3 can. On average, macadamia reactions are milder and less frequently severe than walnut or cashew reactions, and the allergy is often isolated rather than broad, which is a genuine and reassuring difference at the population level.

Here is the part that still justifies carrying epinephrine when your allergist has prescribed it. The lower average is a statement about a population, not a prediction for your child, and documented anaphylaxis to macadamia does occur. The size of the last reaction does not reliably predict the next one, and a child whose only reaction so far was an itchy mouth can still have a worse one. That is not a reason to live in fear; it is the reason the auto-injector travels with the child even though severe macadamia reactions are infrequent.

Emergency preparedness

Macadamia anaphylaxis is treated epinephrine-first. Epinephrine is the first-line treatment for a severe reaction, not an antihistamine and not a wait-and-see. If you see anaphylaxis, you give epinephrine and then you call emergency services.

The signs that mean epinephrine now include any two body systems reacting at once (for example hives plus vomiting), or any single severe sign on its own: trouble breathing, throat tightness, a hoarse or weak cry, repetitive coughing, pale or floppy appearance, or a sense of impending doom in a child old enough to say so. When you are unsure, the guidance is to give epinephrine, because the danger of withholding it in a true reaction is far greater than the danger of giving it when it turns out you did not need to.

After giving epinephrine, call emergency services and lay the child down with legs raised, unless breathing is the main problem, in which case let them sit up. A second dose may be needed if there is no improvement in about five minutes. Every macadamia-allergic child whose allergist has prescribed it should have a written anaphylaxis action plan and the epinephrine auto-injectors that go everywhere the child goes. The fact that macadamia reactions are milder on average does not change this; an anaphylaxis-capable allergy gets an epinephrine plan.

This section is general. Your child’s own plan is the specific one, and it is the one to follow.

When you can’t tell what’s happening

The hardest moments are usually not the clear reactions. They are the ambiguous ones. A flushed cheek after a new food. A single cough. A child who says their mouth feels itchy after a snack you did not pack. For macadamia this ambiguity has its own twist, because macadamia is milder on average, which can quietly train a family to read every macadamia reaction as harmless, and that is exactly the reading the occasional severe reaction punishes.

The posture that works is to treat the spectrum, not to diagnose it in the moment. Know your action plan’s override signs cold, watch whether more than one body system is involved rather than fixating on a single symptom, and accept that you will sometimes give epinephrine or call the allergist for something that turns out to be nothing. That is the system working the way it is supposed to. An itchy mouth that stays an itchy mouth is one thing; an itchy mouth that is joined by hives, vomiting, a cough, or any trouble breathing is the picture to act on.

The competence here builds slowly, over many ambiguous afternoons. It shows up as a shorter pause before you act.

Treatment options

Strict avoidance is the floor, and for macadamia the treatment landscape is genuinely thin beyond it. For a child whose macadamia allergy is confirmed, avoidance plus a written action plan plus the epinephrine your allergist prescribes is the standing setup. Because macadamia has no component test that can narrow the risk and a severe reaction is possible despite the lower average, avoidance is the conservative default once an allergy is confirmed.

Macadamia is different from peanut and egg in an important way: there is no FDA-approved macadamia treatment, no macadamia oral immunotherapy, and not even an established off-label community protocol. The emerging nut-immunotherapy work is concentrated on the common, severe, component-defined nuts (peanut, and the multi-nut work on walnut, cashew, and hazelnut), not on macadamia. This page does not present a macadamia desensitization pathway as available, does not prescribe an off-label one, and frames any future option as a conversation with your child’s allergist along evolving evidence, not a current single answer.

What that leaves is the plan, done well: an accurate diagnosis (which for macadamia often means a supervised oral food challenge, since no component test can settle it), strict avoidance once the allergy is confirmed, an epinephrine auto-injector for an anaphylaxis-capable allergy, and a written action plan that travels with your child.

Not medical advice. Whether and how to manage this is a conversation with your allergist. For macadamia, the single highest-value early conversation is often about diagnosis itself, whether your child is truly allergic to macadamia or is sensitized but tolerant, because macadamia testing over-calls and a supervised challenge is frequently what answers it.

Day-to-day living

School and day care. A macadamia-allergic child needs a written plan on file, epinephrine truly accessible if prescribed, trained staff, and a clear routine for snacks, classroom parties, baking projects, and substitute teachers. In US public schools, a 504 plan is the usual way to put that in writing. Premium or “gourmet” classroom treats (the white-chocolate-macadamia cookie) are the easy one to miss.

Restaurants. The risk is hidden macadamia more than the obvious menu item: macadamia in premium desserts and cookies, in gourmet chocolates, in mixed-nut garnishes, and macadamia oil in dressings. Bakeries, dessert-forward restaurants, and high-end kitchens carry higher macadamia risk. A chef card that names macadamia plainly does more than a verbal order across a loud kitchen.

Travel. Bring more epinephrine than you think you need (if prescribed), carry food you trust, and look up pharmacies and emergency numbers before you land. Macadamia is a signature ingredient in Hawaiian and Australian foods and confectionery, so confirm local dishes and gift sweets carefully when you travel there.

Holidays and gatherings. Mixed-nut bowls, premium cookie tins, gourmet chocolate boxes, and dessert tables are the macadamia-dense settings, and they peak around the holidays. Bringing your child’s own food and being plain with hosts beats hoping a buffet is safe.

Prognosis and outgrowing

Macadamia-specific outgrowing data is genuinely scarce. The honest, class-level picture is that tree-nut allergy, once established, is more often persistent than outgrown, with only a minority of children outgrowing a given tree-nut allergy; a macadamia-specific outgrowing rate is not established at the quality floor, so this page does not publish one.

For most nuts a falling component-IgE number is the encouraging sign to watch, but macadamia has no validated component or resolution marker, so the only available indicator is your child’s clinical course over time. Reassessment cadence is individualized and varies by allergist practice and reaction history (commonly more frequent for a younger child with a mild history and less aggressive after a severe reaction), and no macadamia-specific schedule is established, so the timing is a conversation with your allergist rather than a number this page sets. The one definitive test of whether your child can eat macadamia is a supervised oral food challenge, which for macadamia carries even more of the weight than usual, because no blood-test marker can offer supporting evidence beforehand.

Questions for your allergist

You do not have to walk in knowing the science. You have to walk in with the right questions, and these are them.

1. Is my child’s macadamia allergy likely isolated to macadamia, or does it mean other tree nuts must be avoided too?
2. Is there a macadamia component blood test, or will my child’s testing rely on a whole-extract skin prick and a supervised oral food challenge?
3. Given that macadamia is often milder on average, can my child still have a severe reaction, and should we always carry epinephrine?
4. Is refined macadamia oil in skincare or food a risk for my child, and is gourmet or cold-pressed macadamia oil different?
5. When buying premium cookies, chocolates, or nut mixes, what should we scan for to catch hidden macadamia?
6. When and how should we reassess to see whether my child has outgrown it, or never had it?
7. What will epinephrine actually cost us, and what does our insurance cover?

The frame: how to hold this

There are two worlds, and a food allergy moves a family from one into the other. In the recoverable world, a mistake is a lesson. A forgotten jacket is a cold afternoon. In the irrecoverable world, one wrong protein is not a lesson, because the cost of the error can be the child. When someone tells an allergy parent to relax, they are speaking from the first world to someone who has had to move to the second. They think the parent is anxious. The parent is not anxious. The parent is calibrated.

The work, then, is to sort what is on your side of the line from what is not. On your side: the labels you read, the supervised challenge you ask for, the epinephrine that travels with the child, the chef card, the plan on file at school. Not on your side: the gourmet cookie that carries macadamia and does not flag it, the relative who thinks one bite is kindness, the manufacturer whose precautionary label is voluntary. You do the things on your side fully, and you stop apologizing for them. And you hold, without pretending otherwise, that the other side is real and partly random, and that a stacked defense reduces the risk without ever closing the gap to zero.

Macadamia carries a particular and quiet kind of reassurance, because it is one of the milder and more isolated tree-nut allergies, which means the world is, on average, a little less crowded with threat than it is for a cashew or peanut family. That reassurance is real, and it is also a population average, not a promise about your child, and it is not yours to convert into “one bite is fine” from the kitchen: the diagnosis, the challenge, the verdict all run through your allergist, who actually knows your child. This page does not promise safety. It lays out the layers and names the gap, including the honest gap in what the science knows about macadamia, and it leaves the calibration to you and your allergist.

Related pages on this site

• Macadamia and the other tree nuts, why a macadamia allergy is often isolated
• Why a positive nut test often means tolerance, component testing and the supervised challenge explained
• Reading labels for macadamia, the premium-food deep version
• The tree-nut storage proteins, why a positive test is not reassuring
• Building a macadamia-allergy 504 plan
• Restaurants and travel with a macadamia-allergic child

These companion pages are being written and will be linked here as each one goes live.

Frequently asked questions

Is macadamia a tree nut?

For allergy and labeling purposes, yes. Macadamia is a named major tree-nut allergen, but botanically it sits in its own plant family (Proteaceae), apart from walnut, cashew, hazelnut, and the rest. That botanical isolation is part of why a macadamia allergy is often isolated to macadamia alone (see Cross-reactivity).

Is macadamia allergy less severe than other nut allergies?

On average, yes, and the allergy is often isolated rather than broad, which is genuinely encouraging. But that is a population average, not a promise about any one child: documented anaphylaxis to macadamia does occur, so a confirmed macadamia allergy still means strict avoidance and carrying epinephrine if your allergist prescribes it (see Severity).

Can my macadamia-allergic child eat the other tree nuts?

It is a separate question for each nut, tested rather than assumed. Macadamia is taxonomically isolated from the other tree nuts, and there is no blanket rule that a macadamia allergy means, or rules out, allergy to walnut, cashew, hazelnut, pecan, pistachio, almond, or brazil nut. Your allergist tests and decides nut by nut (see Cross-reactivity).

Is coconut a problem for a macadamia allergy?

Usually not. Coconut is botanically a fruit, not a true tree nut, and most tree-nut-allergic people tolerate it, though confirm with your allergist before introducing it.

Is there a treatment for macadamia allergy?

There is no FDA-approved macadamia-specific treatment and no macadamia oral immunotherapy, and the emerging nut-immunotherapy work is focused on other tree nuts. Management is an accurate diagnosis (often a supervised oral food challenge), strict avoidance, an epinephrine plan, and a written action plan. Any future option is a conversation with your allergist along evolving evidence, not a current step (see Treatment options).

Voices: living with macadamia allergy

Attributed lived experience, kept separate from the clinical facts above. These are individual accounts, not medical guidance, and they carry no clinical claim the page above has not already made. Macadamia-specific first-person stories are genuinely sparse, so this is a short block.

An adult with several tree-nut allergies writes that she found out she was allergic to hazelnuts, walnuts, pecans, and macadamia nuts, and that the differences between nut types matter: “I can’t have a single walnut, but peanut butter is fine.” She describes her first reaction at age twelve, after being encouraged to taste something containing nuts, with her lip, tongue, and throat swelling, and says she stays on alert eating in unfamiliar places, especially at Christmas when these nuts are everywhere.

Source: Sammie Martin, Allergy UK. https://www.allergyuk.org/blog/stories/sammies-story/ One person’s experience of a multi-nut allergy that includes macadamia, not a description of all macadamia allergy and not medical guidance.

References and medical review

This page is pending independent medical review; the note at the top of the page applies until a reviewer is assigned. The references below resolve every in-body citation. The storage-protein red-flag rule and the coconut reassurance are drawn from the project’s verified cross-reactivity floor; macadamia has no authored cross-food cross-reactivity edge (it is taxonomically isolated in Proteaceae), so the “taxonomically isolated, tested not assumed” shape and the premium-food hidden-source picture are sourced from the macadamia research record still pending final review. Where a reference has no resolvable stable identifier, it is listed bibliographically without a link rather than with an unverified URL.

1. Gupta RS, Warren CM, Smith BM, et al. Prevalence of childhood food allergy in the United States. 2019. Cited only for the tree-nut-class prevalence umbrella figure (about 1 to 2 percent in US children), not a macadamia-specific rate.
2. McWilliam V, Koplin J, Lodge C, Tang M, Dharmage S, Allen K. The prevalence and natural history of tree nut allergy: a systematic review. 2018. Used for the tree-nut-class natural-history and age-of-onset direction, carried for macadamia at the class level.
3. Narrative review of macadamia nut allergy (clinical features, the lower-average-potency and frequently-isolated picture, single-component characterization, heat-stable storage proteins, premium-confection hidden sources, and the absence of an established macadamia immunotherapy).
4. EAACI Guideline: diagnosis and management of IgE-mediated food allergy (history plus sensitization testing plus a supervised oral food challenge as the reference standard; the avoidance-plus-action-plan baseline of care; epinephrine-first management). https://doi.org/10.1111/all.15902
5. Food Allergen Labeling and Consumer Protection Act of 2004 (FALCPA), Title II of PL 108-282; tree nuts named individually, macadamia among them. https://www.fda.gov/food/food-allergensgluten-free-guidance-documents-regulatory-information/food-allergen-labeling-and-consumer-protection-act-2004-falcpa
6. Regulation (EU) No 1169/2011 (Annex II allergens, tree nuts; macadamia named); the UK on the assimilated-EU-law basis. https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32011R1169
7. Food Standards Australia New Zealand, allergen labelling under the Australia New Zealand Food Standards Code (mandatory tree-nut declaration; macadamia is a native and commercially significant Australian crop). https://www.foodstandards.gov.au/consumer/labelling/allergen-labelling
8. Cross-reactivity and reassurance claims above resolve to the project’s verified floor where a floor record exists: the tree-nut storage-protein red-flag rule (applied to macadamia’s vicilin-like 7S storage protein) and the coconut reassurance (coconut is a drupe; most tree-nut-allergic people tolerate it; confirm with your allergist before introducing). Macadamia has no authored cross-reactivity edge in the floor, so no macadamia cross-food reassurance or caution is asserted; the taxonomic-isolation shape, the lower-average-potency and frequently-isolated qualifier, and the macadamia hidden-source picture are sourced from the macadamia research record.