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Diamine oxidase (DAO)<\/b> is a digestive enzyme produced primarily in the kidneys, thymus, and the intestinal lining. Its main job is to break down <\/span>histamine<\/b> that comes from the food you eat.<\/span><\/p>\n If you think of histamine as a chemical messenger that can cause “allergic-like” symptoms when levels get too high, DAO is the cleanup crew that keeps those levels in check within the digestive tract.<\/span><\/p>\n When you eat foods high in histamine (like aged cheeses, red wine, or sauerkraut), DAO goes to work in the small intestine. It neutralizes the histamine before it can pass into your bloodstream.<\/span><\/p>\n If DAO levels are sufficient, you likely won’t feel any effects from these foods. However, if DAO levels are low, histamine can build up, leading to a condition known as <\/span>histamine intolerance<\/b>.<\/span><\/p>\n When DAO isn’t doing its job, the resulting histamine buildup can cause a wide range of symptoms that often mimic an allergic reaction:<\/span><\/p>\n Several factors can interfere with how much DAO your body produces or how well it functions:<\/span><\/p>\n For those with a deficiency, management usually involves a <\/span>low-histamine diet<\/b> to reduce the “load” on the enzyme. Additionally, over-the-counter <\/span>DAO supplements<\/b> (usually derived from porcine kidney) can be taken before meals to help process histamine-rich foods.<\/span><\/p>\n While the basics give a good starting point, there are several “advanced” aspects of DAO that are crucial for a full picture, especially if you’re looking into specific brands or managing symptoms more precisely.<\/span><\/p>\n Here is what we haven’t touched on yet:<\/span><\/p>\n DAO doesn’t work in a vacuum; it is a <\/span>metalloprotein<\/b>, meaning it requires specific minerals and vitamins to function. If you are deficient in these, your body might produce enough DAO, but the enzyme will be “turned off”:<\/span><\/p>\n One of the most fascinating things about DAO is that during pregnancy, its production can increase by <\/span>500 to 1,000 times<\/b>.<\/span><\/p>\n The placenta produces massive amounts of DAO to prevent maternal histamine from reaching the fetus (where it could cause premature contractions). This is often why women with chronic migraines or histamine issues suddenly feel “cured” while pregnant.<\/span><\/p>\n DAO is only half the story. It handles <\/span>extracellular<\/b> histamine (the kind in your gut from food). There is a second enzyme called <\/span>Histamine N-methyltransferase (HNMT)<\/b> that handles <\/span>intracellular<\/b> histamine (the kind your body makes itself).<\/span><\/p>\n While many supplements (like the Solaray brand you mentioned) often use animal-derived DAO (porcine kidney), there are natural vegan sources. <\/span>Pea shoots<\/b>, <\/span>lentil sprouts<\/b>, and <\/span>mung bean sprouts<\/b> are naturally high in DAO. Some people incorporate these sprouts into their diet as a functional food for histamine management.<\/span><\/p>\n Some people have variations in the <\/span>AOC1 gene<\/b>, which provides instructions for making DAO. If you have specific “SNPs” (genetic variations) on this gene, your baseline production of DAO might be naturally lower than average, making you more sensitive to high-histamine foods regardless of your gut health.<\/span><\/p>\n DAO is actually a bit of a multi-tasker. It also breaks down other “biogenic amines” like <\/span>spermidine<\/b> and <\/span>putrescine<\/b> (found in aging meat and some vegetables). If your DAO is low, you might be sensitive to a broader range of food compounds than just histamine.<\/span><\/p>\n Managing histamine levels is often described as “filling a bucket.” You might be able to handle a little bit of high-histamine food, but once the bucket overflows (because of DAO-blocking medications or a high-histamine meal), that\u2019s when symptoms kick in.<\/p>\n Here is a breakdown of the primary “bucket fillers” and the factors that can “clog the drain” by inhibiting your DAO.<\/span><\/p>\n Histamine levels in food increase as it ages, ferments, or processes. Freshness is your best friend here.<\/span><\/p>\n Some drinks are a “double hit” because they are high in histamine <\/span>and<\/b> they actively stop your DAO enzyme from working.<\/span><\/p>\n Certain drugs can either directly block the DAO enzyme (Inhibitors) or trigger a massive histamine release (Liberators). If you take any of these regularly, they might be the “invisible” reason your histamine bucket is always full.<\/span><\/p>\nHow It Works<\/b><\/h3>\n
Symptoms of Low DAO<\/b><\/h3>\n
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What Causes Low DAO Levels?<\/b><\/h3>\n
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Management<\/b><\/h3>\n
What we Haven’t Touched about DAO! DAO needs Cofactors to work at top efficiency!<\/em><\/strong><\/h2>\n
1. The “Support Crew” (Cofactors)<\/b><\/h3>\n
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2. The Pregnancy “Superpower”<\/b><\/h3>\n
3. DAO vs. HNMT (The Other Enzyme)<\/b><\/h3>\n
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4. Natural Plant Sources<\/b><\/h3>\n
5. Genetic “Blueprints”<\/b><\/h3>\n
6. It\u2019s Not Just for Histamine<\/b><\/h3>\n
Foods That are High In Histamine!<\/strong><\/h2>\n
High-Histamine Foods to Avoid<\/b><\/h3>\n
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Beverages That Block DAO<\/b><\/h3>\n
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Medications That Affect DAO Levels<\/b><\/h3>\n
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\n Category<\/b><\/td>\n Potential DAO Inhibitors \/ Blockers<\/b><\/td>\n<\/tr>\n \n Antibiotics<\/b><\/td>\n Clavulanic acid (in Augmentin), Cefuroxime, Isoniazid.<\/span><\/td>\n<\/tr>\n \n Heart \/ BP<\/b><\/td>\n Verapamil, Alprenolol, Dihydralazine.<\/span><\/td>\n<\/tr>\n \n Pain \/ NSAIDs<\/b><\/td>\n Aspirin, Naproxen, and Diclofenac (often considered “liberators”).<\/span><\/td>\n<\/tr>\n \n Psychotropic<\/b><\/td>\n Amitriptyline, Citalopram, Diazepam (Valium).<\/span><\/td>\n<\/tr>\n \n GI \/ Stomach<\/b><\/td>\n Cimetidine (Tagamet) and some older H2 blockers.<\/span><\/td>\n<\/tr>\n \n Mucolytics<\/b><\/td>\n Acetylcysteine and Ambroxol (common in cough syrups).<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
![\"DAO](\"https:\/\/vitanetonline.com\/images\/products\/076280363180.jpg\")
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