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It is not an allergy but a metabolism problem of histamine so it may make a flare up after consuming high histamine foods or foods that trigger the release of histamine

39 Most studies used B12 i.m., with slightly varying dosing regimens, commonly 1000 g daily for 57 days, followed by weekly injections for another 34 weeks, and then monthly injections

In earlier studies, we found that the depletion of GSH and cysteine in cord blood of preterm infants correlated with reduced cysteine levels in the mother, while the capacity to synthesize GSH was fully functional in preterm erythrocytes

Novel and Emerging Therapies for Inflammatory Bowel Disease. Frontiers in Pharmacology 12 (2021): 651415

TangJZhangQPengSLiHHuWHaoMet alDifferences in global, regional, and national time trends in disability-adjusted life years for atrial fibrillation and flutter, 19902019: an age-period-cohort analysis from the 2019 global burden of disease study