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Second, the vitamin B12 then combines with intrinsic factor made by the stomach

10.1093/nar/gkw1118 284 WangQ.ZhaoS.GanL.ZhuangZ

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Respiratory system Rhinitis Nasal congestion Sneezing Rhinorrhea (nasal discharge) Dyspnea (difficult or labored breathing) Gastrointestinal system Nausea Vomiting Diarrhea Abdominal pain Constipation Bloating Feelings of fullness after eating any amount Nervous system Headache Dizziness Circulatory system Hypotonia (weakened muscle tone) Tachycardia (rapid heart rate) Collapse Skin Sudden facial erythema (flushing) Pruritus (itchy dry skin) Rashes Eczema Swelling Reproductive system Irregular periods in women What Causes Histamine Intolerance

J Biol Chem 1994

Certain probiotic-rich fermented foods, such as sauerkraut and kimchi, contain appreciable levels of biogenic amines (e.g., histamine and tyramine), which, in susceptible individuals, can trigger headaches or migraines