What role does B12 play in Darmgesundheit?

Vitamin B12 (cobalamin) is critical for cell division, DNA synthesis, and nervous system function. In the context of gut health, B12 supports the rapid turnover of intestinal epithelial cells and helps maintain the gut barrier. The gut microbiota can produce some B12, but not enough to meet human requirements; most B12 must come from diet or supplements. Absorption depends on intrinsic factor from the stomach, and conditions like Crohn's disease, celiac disease, or atrophic gastritis can impair uptake, leading to deficiency. Low B12 has been linked to increased intestinal permeability and inflammation, though the evidence is primarily mechanistic and observational. Randomized controlled trials specifically examining B12 supplementation for gut health are limited. Therefore, the evidence grade is human-moderate. MyBody-X DNA tests do not measure B12 levels or microbiome composition; they cannot assess current B12 status. For personalized advice, a blood test (holotranscobalamin, MMA) is recommended. Always consult a healthcare provider before supplementing.