What role does MTHFR play in Darmgesundheit?

MTHFR (methylenetetrahydrofolate reductase) is a key enzyme in folate and homocysteine metabolism. By supplying methyl groups, it influences DNA methylation, cell division, and inflammatory regulation – processes relevant to gut health. Reduced activity (e.g., via rs1801133, C677T) can raise homocysteine, linked to endothelial dysfunction and chronic inflammation. In the gut, this might impair barrier function and predispose to inflammatory bowel disease (IBD). However, direct evidence for a causal role of MTHFR in gut health is weak. Most associations come from GWAS without specific gut phenotypes. Environmental factors (diet, microbiome) dominate. A genetic test for MTHFR variants alone is not clinically actionable. Supplementation with active folate (5-MTHF) is often marketed, but randomized trials are lacking. Conclusion: MTHFR has plausible but unproven links to gut health. No recommendation for or against supplementation based solely on genotype.