Probiotics and Histamine Sensitivity

Introduction to Histamine Metabolism

Histamine is synthesized from the amino acid L-histidine by the enzyme histidine decarboxylase, and certain bacteria can also produce histamine, which can affect individuals with histamine sensitivity 1
Bacteria that colonize mucosal surfaces or contaminate foods can produce histamine, leading to potential indirect effects on histamine metabolism in the gut 1
Symptoms of histamine excess can affect multiple organ systems, including cardiovascular, respiratory, dermatologic, and gastrointestinal systems 1

Strain-specific effects are critical, as not all probiotics affect histamine metabolism the same way, and selecting strains with documented anti-histamine properties is recommended 2
The "probiotic umbrella" concept that extends benefits from one tested strain to others is problematic and can lead to confusion, highlighting the need for strain-level identification 2

Immunocompromised individuals should use probiotics with extreme caution due to the risk of translocation, and Saccharomyces boulardii has been associated with fungemia in critically ill patients and immunocompromised individuals 2, 3
Patients with damaged intestinal mucosa may be at higher risk for adverse effects, and consulting with a healthcare provider before starting any probiotic regimen is advisable 3

Contamination of probiotic supplements has been documented and can pose serious risks, emphasizing the importance of ensuring probiotic products are from reputable manufacturers with strain-level identification 2