Histamine intolerance test: a shortlist of high-histamine foods to explore first
Headaches after red wine, flushing after aged cheese, allergy tests that came back clear? You’re not imagining it — and you don’t have to keep guessing. Get a personalised shortlist of high-histamine foods worth exploring first, then work through them with a focused 6-week plan.
What this screen is — and what it is not
What it is
A shortlist to start from: we screen your hair sample across 700+ items and your report flags the high-histamine foods worth exploring first
A way to stop guessing randomly: the structured elimination diet is what confirms anything — your report simply tells you where to start
Non-invasive and simple: just 9 or 10 strands of hair, with your report emailed within 3 working days of your sample arriving at our UK lab
What it is not
NOT a validated method. There is no robust published evidence that screening hair identifies which foods do or do not suit you — the report is a starting shortlist, and it is the elimination diary that shows a link.
A medical diagnosis of histamine intolerance: only a doctor can diagnose that
A measure of your DAO enzyme level: the test doesn’t measure how much DAO you produce
An allergy test: it doesn’t measure IgE or IgA antibodies, and histamine intolerance is not an immune-mediated allergy
A cure or treatment: any improvement comes from the elimination process you follow — the report’s job is to make that process focused instead of random
How histamine and the DAO enzyme work
HISTAMINE BUILDS UP IN FOOD: Histamine is a natural chemical that builds up in foods as they age, ferment, or are stored—the older or more fermented the food, the higher the histamine.
THE DAO ENZYME: Your gut lining produces an enzyme called diamine oxidase (DAO) that breaks down dietary histamine before it enters your bloodstream. When DAO activity is lower than average, histamine accumulates faster than your body can clear it, and symptoms follow. Stress, certain medications, vitamin deficiencies, and gut health can all affect DAO performance on any given day.
WHY IT’S NOT AN ALLERGY: This is different from an allergy: there’s no immune system involved, no IgE antibodies, and no anaphylaxis risk. Instead, it’s a dose-dependent issue—symptoms depend on how much histamine you consume and how efficiently your body processes it.
WHAT A HAIR SCREEN CAN’T DO: A hair sample is not a blood test: it doesn’t measure histamine in your body and it doesn’t measure your DAO level. What your report offers is a structured shortlist of high-histamine items to explore first — the real answers come from how your body responds when you actually take those foods out and add them back.
Does this sound like you?
Do you notice flushing, itching, or hives 30–90 minutes after eating aged cheese, cured meats, or fermented foods?
Have you experienced unexplained headaches or headaches that seem linked to leftovers, wine, or foods that have been stored a few days?
Do you get bloating, gas, or digestive discomfort with fermented foods like sauerkraut, miso, or tempeh?
Have standard allergy tests come back negative, yet you still react to certain foods?
Do your symptoms vary day to day, even with the same food—sometimes tolerated, sometimes triggering reactions?
Have you noticed your tolerance improves when you stick to fresh, minimally processed foods but worsens during stressful periods?
Related foods worth checking at the same time
Other fermented foods and drinks: if you react to aged cheese, watch out for sauerkraut, kimchi, miso, tempeh, kombucha, and other fermented condiments—all accumulate histamine over time
Alcohol (especially beer and red wine): fermentation produces histamine, making red wine particularly high; white wine and spirits tend to be lower
Cured and processed meats beyond salami and prosciutto: bacon, pepperoni, sausages, and deli meats all gain histamine during curing
Certain seafood: anchovies, mackerel, tuna, and sardines (especially canned or aged) are naturally high in histamine; fresh fish is much lower
Some fruit and vegetables: avocado, tomatoes, aubergine, spinach, and certain berries can be high in histamine or contain compounds that release it
Leftover cooked foods: storage time allows bacteria to produce histamine, even in fresh foods that were recently cooked
Foods with added histamine or DAO-blocking compounds: chocolate, citrus fruits, vinegar, soy sauce, and certain spices may trigger reactions or inhibit DAO
Foods and items commonly linked to histamine
These are the kinds of items people most often look at for this topic. For the definitive list of what each screen covers, see the full food list and the non-food list.
Aged cheddar, parmesan, blue cheese
Fresh mozzarella vs. aged mozzarella
Salami, pepperoni, prosciutto
Fresh salmon vs. tinned salmon
Anchovies, mackerel, sardines
Red wine, white wine, beer
Sauerkraut, kimchi, miso
Tomatoes, avocado, spinach
Leftover chicken (24 hours)
Fresh strawberries vs. frozen strawberries
Chocolate, citrus fruits
Vinegar, soy sauce
Bacon, ham, smoked meats
How to run a focused elimination
Plan for a focused 6-week core plan, with structured reintroduction afterwards if you want it.
Weeks 1–2: Remove the most common high-histamine triggers: aged cheeses, cured meats, fermented vegetables, red wine, beer, leftovers more than 24 hours old, and aged or tinned fish. Start your food and symptom diary on day one — the 90-day guarantee asks you to follow your plan for at least 6 weeks with a diary.
Weeks 2–3: Build meals around fresh, low-histamine alternatives: fresh meat and poultry eaten the day of cooking, fresh fish within 24 hours, fresh vegetables and fruit (except the high-histamine ones on your list), rice, potatoes and herbal tea.
Weeks 3–6: Hold the elimination steady and keep the diary honest. Most people see a pattern emerge on paper between weeks 2 and 4 — note portion sizes and stressful days too, because histamine tolerance is dose-dependent and varies.
After week 6: If things have settled, move to optional structured reintroduction. Bring back one high-histamine food every 3–4 days in a small, controlled portion (a little aged cheddar on day one, say) and record what happens.
Ongoing: Use what your diary shows to build your personal threshold map. Some people manage small amounts of aged cheese or an occasional glass of wine; others feel best leaving them out for now.
Reintroduce one food every 3–4 days in a small, controlled portion. Wait 24–48 hours before adding another. If symptoms return, stop that food and wait 5–7 days before trying something else. Remember: histamine intolerance is dose-dependent, not all-or-nothing—you may tolerate small amounts of certain foods.
Common questions
Will the test tell me if I have low DAO enzyme?
No. The report flags high-histamine items worth exploring first — it doesn’t measure DAO (only a blood test arranged through your GP can) and it doesn’t measure your body’s response to anything. The elimination diet is what shows you how you actually get on with histamine in foods, and that’s the part that matters for managing symptoms through diet.
Is histamine intolerance the same as a food allergy?
No. An allergy is an immune response (involving IgE antibodies) that can cause anaphylaxis. Histamine intolerance is a digestive issue—your body struggles to break down histamine from food, and symptoms are dose-dependent. Standard allergy tests will be negative, yet you can still react to high-histamine foods. This is why it so often gets missed.
Why do some days feel worse than others, even with the same food?
Histamine tolerance is variable. Stress, poor sleep, infections, hormonal cycles, and other medications can lower your DAO enzyme activity, making you more sensitive on certain days. If you’re stressed and eat aged cheese on the same day, symptoms may be stronger than when you’re calm. This is normal and doesn’t mean you’re getting worse.
Can I still enjoy fermented foods and wine?
Many people with histamine sensitivity can tolerate small amounts of their favourite foods once they work out their personal threshold. Some manage a glass of white wine or a small piece of aged cheese without trouble; others don’t. The elimination diet reveals your limit. Fresh, minimally processed versions are always lower-risk starting points.
How soon will I feel better if I change my diet?
Most people notice improvement within 1–3 weeks of removing high-histamine triggers, though timing varies. Some feel better within days; others take longer. Consistent journalling during the elimination phase helps you spot patterns. Symptom change comes from your dietary changes, not the test—the test just guides which foods to explore.
Should I see my GP before trying this?
If your symptoms are severe, sudden, involve difficulty breathing, or you suspect anaphylaxis, see your GP immediately. For milder symptoms like headaches, bloating, or flushing, you can start an elimination diet while your GP rules out other causes. Our results are most useful alongside GP guidance, not instead of it.
When to speak to your GP. See your GP if you experience sudden or severe symptoms like breathing difficulty, chest pain, severe swelling, or rapid heartbeat—these could indicate anaphylaxis and need emergency care. Also speak to your GP if symptoms don’t improve after your 6-week elimination plan, if you’re taking medications that affect DAO (some antidepressants, antihistamines, or anti-inflammatory drugs), or if you’d like a blood DAO test to support your findings. Your GP can rule out other causes like coeliac disease, true allergies, or other digestive conditions, and can advise whether DAO supplements or dietary adjustments are appropriate for you.
