Quick answer: Some people notice flushing, headaches, a stuffy nose or gut upset after wine, aged cheese, salami or leftovers, which are all high in histamine. Histamine Balance gathers the products I commonly use to support the breakdown of food histamine and a calm mast cell response, and I want to be honest that the research here is earlier-stage than for most of my other protocols.
Key takeaways
Histamine from food is mainly broken down in the gut by an enzyme called DAO, and symptoms can appear when the load is higher than the body can clear.
Mast cells store and release histamine, and nutrients such as quercetin and vitamin C are linked with keeping them steady.
A healthy gut barrier and a balanced microbiome also matter, since some gut bacteria make histamine of their own.
Quick answers
What is histamine intolerance?
It describes symptoms that can show up when histamine from food builds up faster than the body breaks it down, mainly through the DAO enzyme in the gut.
Why do leftovers bother some people?
Histamine rises as food sits, so leftovers, aged and fermented foods tend to carry more histamine than freshly cooked meals.
How strong is the research?
It is early-stage and mostly from small studies, so I suggest pairing supplements with a trial of lower-histamine eating.
Where can I see the products?
They are in my practitioner-grade catalog.
Educational information only, not medical advice.
The mechanisms this protocol supports
Histamine from food is mainly broken down in the gut by an enzyme called diamine oxidase, or DAO. When DAO activity is low or the histamine load is high, histamine can build up faster than the body clears it.
Mast cells are immune cells that store and release histamine, and their stability is influenced by nutrients such as quercetin and vitamin C. A healthy gut barrier and a balanced microbiome also matter, since some gut bacteria make histamine themselves.
Small studies have linked DAO supplementation taken before meals with fewer symptoms in people with histamine intolerance, and early research has linked quercetin with calmer mast cells. Most of this evidence comes from small or early studies, so this protocol is best used together with a trial of lower-histamine eating.
What is in the protocol
The exact products and directions are listed in the Fullscript plan, and here is what each one is commonly used to support.
HistDAO from Xymogen provides diamine oxidase in a tablet designed to release in the small intestine, where it supports the breakdown of food histamine. A phytosome form of quercetin provides quercetin, a plant flavonoid that has been studied for stabilizing mast cells, in a form designed for better absorption.
Buffered vitamin C provides a gentle form of vitamin C, which has been linked with lower blood histamine levels. ProBiota HistaminX from Seeking Health is a probiotic made with Bifidobacterium and Lactobacillus species chosen to leave out strains known to produce histamine.
You can browse quercetin and buffered vitamin C options in my practitioner-grade catalog.
Related protocols you may find helpful include Gut Barrier & Microbiome and Immune Resilience Support.
How to use it thoughtfully
Please talk with your provider before starting, especially if you take medications, are pregnant or nursing, or have a health condition. This page does not list amounts, so follow the label or the specific guidance your provider gives you. When you can, add one product at a time so it is easier to notice how you feel. Sleep, nourishing food, daily movement and stress care are the foundation, and supplements are meant to build on them.
The research on these products is earlier-stage, so please think of this protocol as a careful experiment with your provider. HistDAO is made from pork kidney extract, so it is not suitable for vegetarians or anyone who avoids pork. Quercetin may interact with some medications that are cleared by the liver. Hives with swelling of the lips or tongue, trouble breathing or any sign of a severe allergic reaction needs emergency medical care, not supplements.
Questions to bring to your clinician
These questions can help you get the most out of your next visit.
Could histamine be connected to the reactions I notice after certain foods or drinks?
Could anything in the Histamine Balance protocol interact with my current medications or supplements?
Which labs or symptoms would be worth tracking while I follow the Histamine Balance protocol?
How long would it make sense for me to follow the Histamine Balance protocol before we review how it is going?
What the research shows
Research on histamine intolerance is still early, and this protocol has not been tested as a whole.
Diamine oxidase (DAO) is the main gut enzyme that breaks down food histamine. In a 2019 pilot study by Schnedl and colleagues, 28 adults with suspected histamine intolerance took DAO capsules before meals for four weeks. All 22 tracked symptoms improved during supplementation, and symptom scores rose again after stopping. There was no placebo group, so expectation may explain part of the improvement.
Vitamin C may lower blood histamine. In a 1992 study by Johnston and colleagues, 10 healthy adults took 2 grams of vitamin C a day for two weeks between placebo periods. Blood histamine fell by 38% during vitamin C compared with baseline and withdrawal, but a single 2-gram dose had no effect within four hours. With only 10 people, this is a small study.
Frequently asked questions
Why do leftovers bother some people?
Histamine levels rise as food sits, so leftovers, aged and fermented foods tend to carry more histamine than freshly cooked meals.
How strong is the evidence for this protocol?
The research is earlier-stage and mostly comes from small studies, which is why I recommend pairing it with dietary changes and guidance from a provider.
Sources
- Maintz L, Novak N. Histamine and histamine intolerance. Am J Clin Nutr 2007. PMID: 17490952. https://pubmed.ncbi.nlm.nih.gov/17490952/
- Sánchez-Pérez S, et al. Intestinal Dysbiosis in Patients with Histamine Intolerance. Nutrients 2022. PMID: 35565742. https://pmc.ncbi.nlm.nih.gov/articles/PMC9102523/
- Schnedl WJ, et al. Diamine oxidase supplementation improves symptoms in patients with histamine intolerance. Food Sci Biotechnol 2019. PMID: 31807350. https://pmc.ncbi.nlm.nih.gov/articles/PMC6859183/
- Weng Z, et al. Quercetin is more effective than cromolyn in blocking human mast cell cytokine release and inhibits contact dermatitis and photosensitivity in humans. PLoS One 2012. PMID: 22470478. https://pmc.ncbi.nlm.nih.gov/articles/PMC3314669/
- Johnston CS, Martin LJ, Cai X. Antihistamine effect of supplemental ascorbic acid and neutrophil chemotaxis. J Am Coll Nutr 1992. PMID: 1578094. https://pubmed.ncbi.nlm.nih.gov/1578094/
Educational purposes only. This page shares general information and is not medical advice. These statements have not been evaluated by the Food and Drug Administration, and these products are not intended to replace care from your own healthcare provider. Please talk with your provider before starting any supplement, especially if you take medications, are pregnant or nursing, or have a health condition.
Sources
- Schnedl WJ, Schenk M, Lackner S, et al. Diamine oxidase supplementation improves symptoms in patients with histamine intolerance. Food Sci Biotechnol 2019. PMID: 31807350. https://pubmed.ncbi.nlm.nih.gov/31807350/
- Johnston CS, Martin LJ, Cai X. Antihistamine effect of supplemental ascorbic acid and neutrophil chemotaxis. J Am Coll Nutr 1992. PMID: 1578094. https://pubmed.ncbi.nlm.nih.gov/1578094/
- Maintz L, Novak N. Histamine and histamine intolerance. Am J Clin Nutr 2007. PMID: 17490952. https://pubmed.ncbi.nlm.nih.gov/17490952/
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