Histamine inflammation is triggered by the immune system releasing histamine in response to allergens (pollen, dander, foods like nuts/shellfish), irritants (insect stings, skin contact), stress, exercise, infections, certain foods (fermented, aged, citrus, chocolate), alcohol, and medications, causing blood vessel dilation, itching, and swelling, with severe cases leading to anaphylaxis.
Histamine is a signal in your immune system that tells your body to fight off invaders. It increases blood flow and causes inflammation in nearby tissue, which makes it easier for your immune system to target the invader.
Take supplements. Some research suggests that copper, vitamin B6, and vitamin C can help lower histamine levels. Talk to your doctor before changing your diet or starting supplements. They can help you choose foods, strategies, and supplements that won't interfere with other health conditions or medications.
Medical Conditions
Autoimmune disorders affect immune system function, which might lead to more histamine being released (11). Another condition causing elevated histamine levels is mastocytosis, rare disorder involving abnormal mast cell growth—the cells that make and store histamine (12).
H1 and H2 antihistamines.
Taking antihistamines alone probably won't stop your symptoms, but it could help in combination with dietary changes. H1 histamine inhibitors include cetirizine, loratadine and fexofenadine. They usually treat allergy symptoms. H2 inhibitors include ranitidine and famotidine.
Excess histamine can cause a variety of different symptoms which very often mimic allergic reactions. The most common symptoms are rashes (e.g. hives), itching, flushing, irritable bowel syndrome (IBS), indigestion, breathlessness, palpitations, migraines, dizziness, anxiety/panic, joint aches and nasal congestion.
Dysbiosis, leaky gut, and small intestinal bacterial overgrowth (SIBO) can impair DAO production and lead to histamine buildup. Nutrient Deficiencies: DAO enzyme function depends on certain nutrients, particularly vitamin B6, copper, and vitamin C. Deficiencies in these nutrients can exacerbate histamine intolerance.
Many people believe they experience a “histamine dump.” This phenomenon usually happens at night when your body releases a sudden surge of histamine. A histamine dump can interrupt your sleep and cause headaches, flushing, itching, anxiety, and a racing heart.
Yes, magnesium helps regulate mast cell activity and can reduce histamine release. Does B12 stabilize mast cells? Yes, vitamin B12 supports nervous system health and may help stabilize mast cells, especially in MCAS patients with neurological symptoms.
Histamine-induced anxiety can feel like restlessness, a racing heart, palpitations, or a sense of unease.
Vitamin C. Vitamin C is a very common and well-known nutrient to strengthen the immune system and reduce inflammation. Vitamin C is also required to produce the necessary enzymes for the process of histamine breakdown, making it a vital anti-histamine nutrient.
Histamine levels are another potent downstream target. Allergic symptoms exacerbate during nighttime and plasma histamine levels exhibit nocturnal peaks. In mastocytosis patients, peak levels of plasma histamine were observed in the early morning with the lowest in the afternoon (19).
So if you suffer from histamine intolerance, you should prefer calmer sports such as strength training, Pilates or yoga. Interesting fact: Cardio training releases histamine and other inflammation substances, but the effect only takes temporary (up to 72 hours).
Thus, histamine is an important regulator of sleep—wake cycles and probably contributes to the diurnal changes in other brain functions as well. Histamine also reduces seizure activity, another H1 receptor-mediated effect. H1 antagonists increase seizure onset and/or seizure duration in humans and animals.
Under normal circumstances your GP should be able to make a diagnosis, or send you to the right medical department that could investigate further.
Interestingly, histamine levels did not increase during sleep deprivation suggesting that the histamine levels do not convey the “sleep drive” information to the sleep-promoting neurons of the preoptic hypothalamus (105).
People with mastocytosis have an increased risk of developing a severe and life-threatening allergic reaction. This is known as anaphylaxis. The increased risk of anaphylaxis is caused by the abnormally high number of mast cells and their potential to release large amounts of histamine into the blood.
The role of vitamin B12 in histamine intolerance
Vitamin B12 supports the methylation process—a biochemical pathway that helps the body detoxify and regulate histamine levels. When B12 is lacking, methylation slows down, leading to higher histamine concentrations in the blood.
Hydroxyzine is used to help control anxiety and tension caused by nervous and emotional conditions. It can also be used to help control anxiety and produce sleep before surgery. This medicine is also used to relieve symptoms of allergic conditions (eg, chronic urticaria and atopic and contact dermatoses).
Natural antihistamines like ginger, turmeric, and capers offer effective, holistic ways to manage allergies. While these remedies may not replace traditional treatments for severe cases, they can significantly reduce symptoms when used consistently.
Ginger is a histamine blocker or antihistamine but is also great for the immune system. Shave off a small piece of ginger and put it in a mug. Pour hot water over it and steep for 3-5 minutes.