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Serum B12 and basic hematologic tests usually provide a clear answer

Dysregulation of Th17 activity has been implicated in the pathogenesis of inflammatory and autoimmune disorders, including colitis

Fujii T, Tsuchiya T, Yamada S, Fujimoto K, Suzuki T, Kasahara T, et al

Vitamin B12 (cobalamin) is an essential water-soluble vitamin crucial for red blood cell formation, neurological function, and cellular energy production
