Treatment of Histamine Intolerance Using Probiotic Intervention

Inclusion Criteria: * Signed consent form * Symptoms of histamine intolerance (based on medical history) * DAO \< 10 U/mL * Age 18-70 years * Willingness to refrain from changing eating habits and physical activity during the study * Sufficient understanding of the German language and sufficient mental state to understand information and instructions related to the study Exclusion Criteria: * Lactose intolerance * Fructose malabsorption * Helicobacter pylori infection * Celiac disease * Chronic inflammatory bowel disease * Food allergy with gastrointestinal manifestation * Mastocytosis * Use of antihistamines * Other gastrointestinal diseases or use of gastrointestinal medications, as determined by the investigator * (Planned) change in current medication, as determined by the investigator * Pregnancy and breastfeeding * Inability to take the investigational drug orally * Intolerance to the investigational drug * Admission to a clinic or similar facility due to official or court order * Participation in another clinical trial (currently or within the last 30 days prior to study start) * A health condition or regular medication use that, in the opinion of the investigator, does not allow participation in the study or the evaluation of study parameters or the consumption of the investigational drug (individual decision)