Can B12 help with Darmgesundheit?

Vitamin B12 is essential for cell division, blood formation, and nervous system function – including in the gut. A deficiency can impair the intestinal lining and lead to malabsorption. There is also evidence that B12 influences the microbiome: certain gut bacteria (e.g., Bacteroidetes) require B12 for their metabolism, while others (e.g., Firmicutes) produce it. An imbalance could indirectly disrupt gut health. However, the evidence for targeted B12 supplementation for gut complaints without proven deficiency is weak. Most findings come from observational or mechanistic studies. If you experience non-specific gastrointestinal symptoms, a blood test for B12 should be done before supplementing. Excess B12 is usually harmless but can signal underlying issues. Overall, B12 is an important cofactor for gut health but not a cure-all. A balanced diet with B12 sources (meat, fish, eggs, fortified foods) is the foundation. For vegans or older adults with absorption issues, supplementation may be beneficial – but always after medical consultation.