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1 Vitamin B12 is water-soluble, and excess amounts are excreted in the urine

Related article: DAO Enzyme Supplements and Research Studies Vitamin B6 (P5P) and copper: Vitamin B6 and copper are both cofactors in the reactions that degrade histamine.[ref] Pyridoxal-5-phosphate is the active form of vitamin B6

Atrophic gastritis is common in older adults and quietly reduces B12 absorption from food

Black or tarry stool, visible blood in the stool, vomiting blood, severe abdominal pain, unexplained weight loss, persistent fever, anemia, or progressive swallowing difficulty should be evaluated appropriately

However, head-to-head clinical trials remain limited

Systemic analyses of immunophenotypes of peripheral T cells in non-segmental vitiligo: implication of defective natural killer T cells